Do not use local override for language settings: always sync.

chrome/browser/profiles/profile_impl.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/profiles/profile_impl.h"
 
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 1348 matching lines @@
     }
   }
   */
   return instant_promo_counter_.get();
 #else
   return NULL;
 #endif
 }
 
 #if defined(OS_CHROMEOS)
-void ProfileImpl::ChangeApplicationLocale(
-    const std::string& locale, bool keep_local) {
+void ProfileImpl::ChangeApplicationLocale(const std::string& locale) {
   if (locale.empty()) {
     NOTREACHED();
     return;
   }
-  if (keep_local) {
-    GetPrefs()->SetString(prefs::kApplicationLocaleOverride, locale);
-  } else {
-    GetPrefs()->SetString(prefs::kApplicationLocale, locale);
-    GetPrefs()->ClearPref(prefs::kApplicationLocaleOverride);
-  }
+  GetPrefs()->SetString(prefs::kApplicationLocale, locale);
+  // We keep kApplicationLocaleBackup value as a reference.  In case value
+  // of kApplicationLocale preference would change due to sync from other
+  // device then kApplicationLocaleBackup value will trigger and allow us
+  // to show notification about automatic locale change in LocaleChangeGuard.
   GetPrefs()->SetString(prefs::kApplicationLocaleBackup, locale);
   GetPrefs()->ClearPref(prefs::kApplicationLocaleAccepted);
   // We maintain kApplicationLocale property in both a global storage
   // and user's profile.  Global property determines locale of login screen,
   // while user's profile determines his personal locale preference.
   g_browser_process->local_state()->SetString(
       prefs::kApplicationLocale, locale);
 
   GetPrefs()->SavePersistentPrefs();
   g_browser_process->local_state()->SavePersistentPrefs();
@@ skipping 23 matching lines @@
 }
 
 PrerenderManager* ProfileImpl::GetPrerenderManager() {
   CommandLine* cl = CommandLine::ForCurrentProcess();
   if (!cl->HasSwitch(switches::kEnablePagePrerender))
     return NULL;
   if (!prerender_manager_)
     prerender_manager_ = new PrerenderManager(this);
   return prerender_manager_;
 }