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

chrome/browser/chromeos/login/mock_user_manager.cc

 // Copyright (c) 2012 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/mock_user_manager.h"
 
 namespace chromeos {
 
 MockUserManager::MockUserManager() : user_(NULL),
                                      user_flow_(new DefaultUserFlow()) {}
@@ skipping 11 matching lines @@
 }
 
 const User* MockUserManager::GetActiveUser() const {
   return user_;
 }
 
 User* MockUserManager::GetActiveUser() {
   return user_;
 }
 
+const User* MockUserManager::GetPrimaryUser() const {
+  return user_;
+}
+
 UserImageManager* MockUserManager::GetUserImageManager() {
   return user_image_manager_.get();
 }
 
 // Creates a new User instance.
 void MockUserManager::SetActiveUser(const std::string& email) {
   delete user_;
   user_ = User::CreateRegularUser(email);
 }
 
 UserFlow* MockUserManager::GetCurrentUserFlow() const {
   return user_flow_.get();
 }
 
 UserFlow* MockUserManager::GetUserFlow(const std::string&) const {
   return user_flow_.get();
 }
 
 User* MockUserManager::CreatePublicAccountUser(const std::string& email) {
   delete user_;
   user_ = User::CreatePublicAccountUser(email);
   return user_;
 }
 
 }  // namespace chromeos