ChromeOS: Implement periodic timezone refresh on geolocation data.

chrome/browser/ui/webui/options/browser_options_handler.h

Index: chrome/browser/ui/webui/options/browser_options_handler.h
diff --git a/chrome/browser/ui/webui/options/browser_options_handler.h b/chrome/browser/ui/webui/options/browser_options_handler.h
index d6c99e5b4a45a8a0d5ed7c1ae215234a9da91faa..722cdf8bfbdb603c46dc92dc0ef7eca08424237f 100644
--- a/chrome/browser/ui/webui/options/browser_options_handler.h
+++ b/chrome/browser/ui/webui/options/browser_options_handler.h
@@ -226,6 +226,11 @@ class BrowserOptionsHandler
   // |false| and preventing the user from changing the wallpaper if |managed| is
   // |true|.
   void OnWallpaperManagedChanged(bool managed);
+
+  // Updates the UI, allowing the user to change the system time zone if
+  // kSystemTimezonePolicy is set, and preventing the user from changing the
+  // system time zone if kSystemTimezonePolicy is not set.
+  void OnSystemTimezonePolicyChanged();
 #endif
 
   // Callback for the "selectDownloadLocation" message. This will prompt the