Make ChromeSigninClient a BrowserContextKeyedService

chrome/browser/signin/chrome_signin_client.h

 // 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.
 
 #ifndef CHROME_BROWSER_SIGNIN_CHROME_SIGNIN_CLIENT_H_
 #define CHROME_BROWSER_SIGNIN_CHROME_SIGNIN_CLIENT_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 #include "components/signin/core/signin_client.h"
 
 class CookieSettings;
 class Profile;
 
-class ChromeSigninClient : public SigninClient {
+class ChromeSigninClient : public SigninClient,
+                           public BrowserContextKeyedService {
  public:
   explicit ChromeSigninClient(Profile* profile);
   virtual ~ChromeSigninClient();
 
   // Utility methods.
   static bool ProfileAllowsSigninCookies(Profile* profile);
   static bool SettingsAllowSigninCookies(CookieSettings* cookie_settings);
 
   // SigninClient implementation.
   virtual bool AreSigninCookiesAllowed() OVERRIDE;
 
  private:
-  // Non-owning; this object is owned by the SigninManager, which is
-  // outlived by Profile.
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeSigninClient);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_CHROME_SIGNIN_CLIENT_H_