Extract Profile-independent GCMService from GCMProfileService

chrome/browser/invalidation/device_invalidation_auth_provider_chromeos.h

 // 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.
 
 #ifndef CHROME_BROWSER_INVALIDATION_DEVICE_INVALIDATION_AUTH_PROVIDER_CHROMEOS_H_
 #define CHROME_BROWSER_INVALIDATION_DEVICE_INVALIDATION_AUTH_PROVIDER_CHROMEOS_H_
 
 #include "base/macros.h"
 #include "chrome/browser/invalidation/invalidation_auth_provider.h"
 
 namespace chromeos {
 class DeviceOAuth2TokenService;
 }
 
 namespace invalidation {
 
 // Authentication provider implementation backed by DeviceOAuth2TokenService.
 class DeviceInvalidationAuthProvider : public InvalidationAuthProvider {
  public:
   DeviceInvalidationAuthProvider(
       chromeos::DeviceOAuth2TokenService* token_service);
   virtual ~DeviceInvalidationAuthProvider();
 
   // InvalidationAuthProvider:
+  virtual std::string GetUsername() OVERRIDE;
   virtual std::string GetAccountId() OVERRIDE;
   virtual OAuth2TokenService* GetTokenService() OVERRIDE;
   virtual bool ShowLoginUI() OVERRIDE;
 
  private:
   chromeos::DeviceOAuth2TokenService* token_service_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceInvalidationAuthProvider);
 };
 
 }  // namespace invalidation
 
 #endif  // CHROME_BROWSER_INVALIDATION_DEVICE_INVALIDATION_AUTH_PROVIDER_CHROMEOS_H_