Extract Profile-independent GCMService from GCMProfileService

chrome/browser/invalidation/device_invalidation_auth_provider_chromeos.cc

 // Copyright 2014 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/invalidation/device_invalidation_auth_provider_chromeos.h"
 
 #include "chrome/browser/chromeos/settings/device_oauth2_token_service.h"
 
 namespace invalidation {
 
 DeviceInvalidationAuthProvider::DeviceInvalidationAuthProvider(
     chromeos::DeviceOAuth2TokenService* token_service)
     : token_service_(token_service) {}
 
 DeviceInvalidationAuthProvider::~DeviceInvalidationAuthProvider() {}
 
+std::string DeviceInvalidationAuthProvider::GetUsername() {
+  return token_service_->GetRobotAccountId();
+}
+
 std::string DeviceInvalidationAuthProvider::GetAccountId() {
   return token_service_->GetRobotAccountId();
 }
 
 OAuth2TokenService* DeviceInvalidationAuthProvider::GetTokenService() {
   return token_service_;
 }
 
 bool DeviceInvalidationAuthProvider::ShowLoginUI() { return false; }
 
 }  // namespace invalidation