Fix lint errors

homeassistant/components/history.py

@@ -11,7 +11,6 @@ from itertools import groupby
 
 from homeassistant.components import recorder, script
 import homeassistant.util.dt as dt_util
-from homeassistant.const import HTTP_BAD_REQUEST
 from homeassistant.components.http import HomeAssistantView
 
 DOMAIN = 'history'

homeassistant/components/logbook.py

@@ -15,7 +15,7 @@ import homeassistant.util.dt as dt_util
 from homeassistant.components import recorder, sun
 from homeassistant.const import (
     EVENT_HOMEASSISTANT_START, EVENT_HOMEASSISTANT_STOP, EVENT_STATE_CHANGED,
-    HTTP_BAD_REQUEST, STATE_NOT_HOME, STATE_OFF, STATE_ON)
+    STATE_NOT_HOME, STATE_OFF, STATE_ON)
 from homeassistant.core import DOMAIN as HA_DOMAIN
 from homeassistant.core import State
 from homeassistant.helpers.entity import split_entity_id