diff --git a/core/modules/text/lib/Drupal/text/Tests/Formatter/TextPlainUnitTest.php b/core/modules/text/lib/Drupal/text/Tests/Formatter/TextPlainUnitTest.php
index 38d184e4c05..9f986abbc18 100644
--- a/core/modules/text/lib/Drupal/text/Tests/Formatter/TextPlainUnitTest.php
+++ b/core/modules/text/lib/Drupal/text/Tests/Formatter/TextPlainUnitTest.php
@@ -49,7 +49,6 @@ class TextPlainUnitTest extends DrupalUnitTestBase {
     // Configure the theme system.
     $this->installConfig(array('system', 'field'));
     $this->installSchema('entity_test', 'entity_test');
-    $this->installSchema('user', 'users');
 
     // @todo Add helper methods for all of the following.
 
diff --git a/core/modules/user/lib/Drupal/user/Entity/User.php b/core/modules/user/lib/Drupal/user/Entity/User.php
index 80fc18ad7f8..35af76a8b11 100644
--- a/core/modules/user/lib/Drupal/user/Entity/User.php
+++ b/core/modules/user/lib/Drupal/user/Entity/User.php
@@ -266,13 +266,6 @@ class User extends ContentEntityBase implements UserInterface {
     return $this;
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function getDefaultTheme() {
-    return $this->get('theme')->value;
-  }
-
   /**
    * {@inheritdoc}
    */
@@ -482,11 +475,6 @@ class User extends ContentEntityBase implements UserInterface {
       ->setLabel(t('Signature format'))
       ->setDescription(t('The signature format of this user.'));
 
-    $fields['theme'] = FieldDefinition::create('string')
-      ->setLabel(t('Theme'))
-      ->setDescription(t('The default theme of this user.'))
-      ->setPropertyConstraints('value', array('Length' => array('max' => DRUPAL_EXTENSION_NAME_MAX_LENGTH)));
-
     $fields['timezone'] = FieldDefinition::create('string')
       ->setLabel(t('Timezone'))
       ->setDescription(t('The timezone of this user.'))
diff --git a/core/modules/user/lib/Drupal/user/Tests/UserRegistrationTest.php b/core/modules/user/lib/Drupal/user/Tests/UserRegistrationTest.php
index a164da94968..8b6bb8c7176 100644
--- a/core/modules/user/lib/Drupal/user/Tests/UserRegistrationTest.php
+++ b/core/modules/user/lib/Drupal/user/Tests/UserRegistrationTest.php
@@ -182,7 +182,6 @@ class UserRegistrationTest extends WebTestBase {
     $new_user = reset($accounts);
     $this->assertEqual($new_user->getUsername(), $name, 'Username matches.');
     $this->assertEqual($new_user->getEmail(), $mail, 'E-mail address matches.');
-    $this->assertEqual($new_user->theme->value, '', 'Correct theme field.');
     $this->assertEqual($new_user->getSignature(), '', 'Correct signature field.');
     $this->assertTrue(($new_user->getCreatedTime() > REQUEST_TIME - 20 ), 'Correct creation time.');
     $this->assertEqual($new_user->isActive(), $config_user_settings->get('register') == USER_REGISTER_VISITORS ? 1 : 0, 'Correct status field.');
diff --git a/core/modules/user/lib/Drupal/user/Tests/UserValidationTest.php b/core/modules/user/lib/Drupal/user/Tests/UserValidationTest.php
index 642120f2d78..cf68623ee77 100644
--- a/core/modules/user/lib/Drupal/user/Tests/UserValidationTest.php
+++ b/core/modules/user/lib/Drupal/user/Tests/UserValidationTest.php
@@ -125,10 +125,6 @@ class UserValidationTest extends DrupalUnitTestBase {
     $this->assertLengthViolation($user, 'signature', 255);
     $user->set('signature', NULL);
 
-    $user->set('theme', $this->randomString(DRUPAL_EXTENSION_NAME_MAX_LENGTH + 1));
-    $this->assertLengthViolation($user, 'theme', DRUPAL_EXTENSION_NAME_MAX_LENGTH);
-    $user->set('theme', NULL);
-
     $user->set('timezone', $this->randomString(33));
     $this->assertLengthViolation($user, 'timezone', 32);
     $user->set('timezone', NULL);
diff --git a/core/modules/user/lib/Drupal/user/Theme/UserNegotiator.php b/core/modules/user/lib/Drupal/user/Theme/UserNegotiator.php
deleted file mode 100644
index f601acf6ca1..00000000000
--- a/core/modules/user/lib/Drupal/user/Theme/UserNegotiator.php
+++ /dev/null
@@ -1,68 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\user\Theme\UserNegotiator.
- */
-
-namespace Drupal\user\Theme;
-
-use Drupal\Core\Entity\EntityManager;
-use Drupal\Core\Session\AccountInterface;
-use Drupal\Core\Theme\ActiveTheme;
-use Drupal\Core\Theme\ThemeNegotiatorInterface;
-use Symfony\Component\HttpFoundation\Request;
-
-/**
- * Defines the theme negotiator service for theme configured per user.
- */
-class UserNegotiator implements  ThemeNegotiatorInterface {
-
-  /**
-   * The user storage controller.
-   *
-   * @var \Drupal\user\UserStorageControllerInterface
-   */
-  protected $userStorageController;
-
-  /**
-   * The current user.
-   *
-   * @var \Drupal\Core\Session\AccountInterface
-   */
-  protected $currentUser;
-
-  /**
-   * Constructs a UserNegotiator object.
-   *
-   * @param \Drupal\Core\Entity\EntityManager $entity_manager
-   *   The entity manager
-   * @param \Drupal\Core\Session\AccountInterface $current_user
-   *   The current user.
-   */
-  public function __construct(EntityManager $entity_manager, AccountInterface $current_user) {
-    $this->userStorageController = $entity_manager->getStorageController('user');
-    $this->currentUser = $current_user;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function applies(Request $request) {
-    return TRUE;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function determineActiveTheme(Request $request) {
-    if ($user = $this->userStorageController->load($this->currentUser->id())) {;
-      // Only select the user selected theme if it is available in the
-      // list of themes that can be accessed.
-      if (!empty($user->theme) && drupal_theme_access($user->theme)) {
-        return $user->theme;
-      }
-    }
-  }
-
-}
diff --git a/core/modules/user/lib/Drupal/user/UserInterface.php b/core/modules/user/lib/Drupal/user/UserInterface.php
index e2474bc8229..4022179e8c1 100644
--- a/core/modules/user/lib/Drupal/user/UserInterface.php
+++ b/core/modules/user/lib/Drupal/user/UserInterface.php
@@ -83,14 +83,6 @@ interface UserInterface extends ContentEntityInterface, AccountInterface {
    */
   public function setEmail($mail);
 
-  /**
-   * Returns the default theme of the user.
-   *
-   * @return string
-   *   Name of the theme.
-   */
-  public function getDefaultTheme();
-
   /**
    * Returns the user signature.
    *
diff --git a/core/modules/user/user.install b/core/modules/user/user.install
index 67c9fcca438..a194b00762a 100644
--- a/core/modules/user/user.install
+++ b/core/modules/user/user.install
@@ -58,13 +58,6 @@ function user_schema() {
         'default' => '',
         'description' => "User's e-mail address.",
       ),
-      'theme' => array(
-        'type' => 'varchar',
-        'length' => DRUPAL_EXTENSION_NAME_MAX_LENGTH,
-        'not null' => TRUE,
-        'default' => '',
-        'description' => "User's default theme.",
-      ),
       'signature' => array(
         'type' => 'varchar',
         'length' => 255,
@@ -998,16 +991,6 @@ function user_update_8019() {
     db_change_field('users_data', 'module', 'module', $spec);
   }
 
-  if (db_field_exists('users', 'theme')) {
-    $spec = array(
-      'type' => 'varchar',
-      'length' => 50,
-      'not null' => TRUE,
-      'default' => '',
-      'description' => "User's default theme.",
-    );
-    db_change_field('users', 'theme', 'theme', $spec);
-  }
 }
 
 /**
diff --git a/core/modules/user/user.services.yml b/core/modules/user/user.services.yml
index 05382aff7aa..d255dfdba56 100644
--- a/core/modules/user/user.services.yml
+++ b/core/modules/user/user.services.yml
@@ -25,11 +25,6 @@ services:
     class: Drupal\user\EventSubscriber\MaintenanceModeSubscriber
     tags:
       - { name: event_subscriber }
-  theme.negotiator.user:
-    class: Drupal\user\Theme\UserNegotiator
-    arguments: ['@entity.manager', '@current_user']
-    tags:
-      - { name: theme_negotiator, priority: -50 }
   theme.negotiator.admin_theme:
     class: Drupal\user\Theme\AdminNegotiator
     arguments: ['@current_user', '@config.factory', '@entity.manager']
diff --git a/core/modules/views/lib/Drupal/views/Tests/Handler/FieldCounterTest.php b/core/modules/views/lib/Drupal/views/Tests/Handler/FieldCounterTest.php
index 897bfd923de..87732485d45 100644
--- a/core/modules/views/lib/Drupal/views/Tests/Handler/FieldCounterTest.php
+++ b/core/modules/views/lib/Drupal/views/Tests/Handler/FieldCounterTest.php
@@ -19,7 +19,7 @@ class FieldCounterTest extends ViewUnitTestBase {
    *
    * @var array
    */
-  public static $modules = array('user', 'field');
+  public static $modules = array('user');
 
   /**
    * Views used by this test.
@@ -36,12 +36,6 @@ class FieldCounterTest extends ViewUnitTestBase {
     );
   }
 
-  protected function setUp() {
-    parent::setUp();
-
-    $this->installSchema('user', 'users');
-  }
-
   function testSimple() {
     $view = views_get_view('test_view');
     $view->setDisplay();
diff --git a/core/modules/views/lib/Drupal/views/Tests/Handler/FieldUnitTest.php b/core/modules/views/lib/Drupal/views/Tests/Handler/FieldUnitTest.php
index affd9bdc526..6ad3b19a4d7 100644
--- a/core/modules/views/lib/Drupal/views/Tests/Handler/FieldUnitTest.php
+++ b/core/modules/views/lib/Drupal/views/Tests/Handler/FieldUnitTest.php
@@ -17,7 +17,7 @@ use Drupal\views\Plugin\views\field\FieldPluginBase;
  */
 class FieldUnitTest extends ViewUnitTestBase {
 
-  public static $modules = array('user', 'field');
+  public static $modules = array('user');
 
   /**
    * Views used by this test.
@@ -38,12 +38,6 @@ class FieldUnitTest extends ViewUnitTestBase {
     );
   }
 
-  protected function setUp() {
-    parent::setUp();
-
-    $this->installSchema('user', 'users');
-  }
-
   /**
    * Overrides Drupal\views\Tests\ViewTestBase::viewsData().
    */
diff --git a/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayPageTest.php b/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayPageTest.php
index 32c3bfc8659..b0d830b6ec7 100644
--- a/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayPageTest.php
+++ b/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayPageTest.php
@@ -59,7 +59,6 @@ class DisplayPageTest extends ViewUnitTestBase {
     // Setup the needed tables in order to make the drupal router working.
     $this->installSchema('system', array('router', 'menu_router', 'url_alias'));
     $this->installSchema('menu_link', 'menu_links');
-    $this->installSchema('user', 'users');
   }
 
   /**