Timezone auto update option should be available by default.

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 6017 matching lines @@
   <message name="IDS_SET_TIME_BUTTON_CLOSE" desc="Text for the button to close the window.">
     Done
   </message>
   <message name="IDS_SET_TIME_DATE_LABEL" desc="Label for the date input element.">
     System date
   </message>
   <message name="IDS_SET_TIME_TIME_LABEL" desc="Label for the time input element.">
     System time
   </message>
 
-  <message name="IDS_FLAGS_ENABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_NAME" desc="Title for the flag to enable/disable user setting to automatically update timezone by user geolocation.">
-    Automatically resolve timezone by geolocation
+  <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_ENABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION" desc="Description for the flag to enable/disable user setting to automatically update timezone by user geolocation.">
-    If enabled, in chrome://settings a new option becomes available which allows automatically updating the timezone by the current geolocation.
+  <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 enabled, automatic timezone update by the current geolocation is turned off.

[stevenjb, 2015/02/02 21:14:40]

nit: s/enabled/set

[Alexander Alekseev, 2015/02/03 08:29:56]

Done.

   </message>
   <message name="IDS_OPTIONS_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION" desc="Label for checkbox to allow automatic timezone update by user geolocation.">
     Automatically resolve timezone by geolocation
   </message>
 </grit-part>