ChromeOS: Update browser option UI for automatic timezone detection.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 1967 matching lines @@
   </message>
   <message name="IDS_OPTIONS_BATTERY_STATUS_LABEL" desc="The label for the battery information in the 'Power' overlay.">
     Battery:
   </message>
   <message name="IDS_OPTIONS_SETTINGS_BATTERY_DESCRIPTION" desc="The 'Battery' button on the chrome://settings page.">
     Battery...
   </message>
   <message name="IDS_OPTIONS_SETTINGS_STORAGE_DESCRIPTION" desc="The 'Storage' button on the chrome://settings page.">
     Stored data...
   </message>
-  <message name="IDS_OPTIONS_SETTINGS_TIME_SYNCED_EXPLANATION" desc="In the settings tab, the text indicating that the date and time are set automatically.">
-    Date and time are set automatically.
-  </message>
   <message name="IDS_OPTIONS_SETTINGS_SET_TIME_BUTTON" desc="In the settings tab, the prompt on the button to open a dialog to set date and time.">
     Set date and time
   </message>
   <message name="IDS_OPTIONS_SETTINGS_TIMEZONE_DESCRIPTION" desc="In the settings tab, the text next to the timezone combobox.">
     Time zone:
   </message>
   <message name="IDS_OPTIONS_SETTINGS_USE_24HOUR_CLOCK_DESCRIPTION" desc="In the settings tab, the text next to the checkbox that enables 24-hour clock.">
     Use 24-hour clock
   </message>
   <message name="IDS_OPTIONS_SETTINGS_TIMEZONE_DISPLAY_TEMPLATE" desc="In the settings tab, the display template of a timezone in the pull-down list of timezones">
@@ skipping 4079 matching lines @@
   <message name="IDS_FLAGS_DISABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_NAME" desc="Title for the flag to disable automatic timezone update on user location change.">
     Disable automatic timezone update by geolocation
   </message>
   <message name="IDS_FLAGS_DISABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION" desc="Description for the flag to disable user setting to automatically update timezone by user geolocation.">
     If set, automatic timezone update by the current geolocation is turned off.
   </message>
   <message name="IDS_OPTIONS_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION" desc="Label for checkbox to allow automatic timezone update by user geolocation.">
     Set time zone automatically using your location
   </message>
 </grit-part>