Refactor OAuth2TokenService to have profile- and device-based implementations.

chrome/browser/signin/oauth2_token_service_factory.h

-// Copyright 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.
-
-#ifndef CHROME_BROWSER_SIGNIN_OAUTH2_TOKEN_SERVICE_FACTORY_H_
-#define CHROME_BROWSER_SIGNIN_OAUTH2_TOKEN_SERVICE_FACTORY_H_
-
-#include "base/memory/singleton.h"
-#include "chrome/browser/profiles/profile_keyed_service_factory.h"
-
-class OAuth2TokenService;
-class Profile;
-
-// Singleton that owns all OAuth2TokenServices and associates them with
-// Profiles. Listens for the Profile's destruction notification and cleans up
-// the associated OAuth2TokenService.
-class OAuth2TokenServiceFactory : public ProfileKeyedServiceFactory {
- public:
-  // Returns the instance of OAuth2TokenService associated with this profile
-  // (creating one if none exists). Returns NULL if this profile cannot have a
-  // OAuth2TokenService (for example, if |profile| is incognito).
-  static OAuth2TokenService* GetForProfile(Profile* profile);
-
-  // Returns an instance of the OAuth2TokenServiceFactory singleton.
-  static OAuth2TokenServiceFactory* GetInstance();
-
- private:
-  friend struct DefaultSingletonTraits<OAuth2TokenServiceFactory>;
-
-  OAuth2TokenServiceFactory();
-  virtual ~OAuth2TokenServiceFactory();
-
-  // ProfileKeyedServiceFactory implementation.
-  virtual ProfileKeyedService* BuildServiceInstanceFor(
-      Profile* profile) const OVERRIDE;
-
-  DISALLOW_COPY_AND_ASSIGN(OAuth2TokenServiceFactory);
-};
-
-#endif  // CHROME_BROWSER_SIGNIN_OAUTH2_TOKEN_SERVICE_FACTORY_H_