If user profile doesn't contain language setting, default to his Google account settings.

chrome/browser/chromeos/login/fake_user_manager.cc

 // Copyright 2013 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/chromeos/login/fake_user_manager.h"
 
 namespace {
 
 // As defined in /chromeos/dbus/cryptohome_client.cc.
 static const char kUserIdHashSuffix[] = "-hash";
@@ skipping 66 matching lines @@
     const string16& display_name) {
   for (UserList::iterator it = user_list_.begin();
        it != user_list_.end(); ++it) {
     if ((*it)->email() == username) {
       (*it)->set_display_name(display_name);
       return;
     }
   }
 }
 
+void FakeUserManager::UpdateUserAccountData(const std::string&, const string16&,
+                           const std::string&) {
+  // Not implemented
+}
+
 UserImageManager* FakeUserManager::GetUserImageManager() {
   return NULL;
 }
 
 const UserList& FakeUserManager::GetLRULoggedInUsers() {
   return user_list_;
 }
 
 UserList FakeUserManager::GetUnlockUsers() const {
   return user_list_;
@@ skipping 152 matching lines @@
 bool FakeUserManager::AreLocallyManagedUsersAllowed() const {
   return true;
 }
 
 base::FilePath FakeUserManager::GetUserProfileDir(
     const std::string&email) const {
   return base::FilePath();
 }
 
 }  // namespace chromeos