[Clean-up] Remove some dead code for handling Webstore sign-in.

chrome/browser/signin/fake_signin_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_SIGNIN_FAKE_SIGNIN_MANAGER_H_
 #define CHROME_BROWSER_SIGNIN_FAKE_SIGNIN_MANAGER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 46 matching lines @@
   virtual void StartSignInWithRefreshToken(
       const std::string& refresh_token,
       const std::string& username,
       const std::string& password,
       const OAuthTokenFetchedCallback& oauth_fetched_callback) OVERRIDE;
 
   virtual void SignOut(signin_metrics::ProfileSignout signout_source_metric)
       OVERRIDE;
 
   virtual void CompletePendingSignin() OVERRIDE;
-
-  virtual void AddMergeSessionObserver(
-      MergeSessionHelper::Observer* observer) OVERRIDE;
-  virtual void RemoveMergeSessionObserver(
-      MergeSessionHelper::Observer* observer) OVERRIDE;
-
-  void NotifyMergeSessionObservers(const GoogleServiceAuthError& error);
-
- private:
-  ObserverList<MergeSessionHelper::Observer, true> merge_session_observer_list_;
 };
 
 #endif  // !defined (OS_CHROMEOS)
 
 #if defined(OS_CHROMEOS)
 typedef FakeSigninManagerBase FakeSigninManagerForTesting;
 #else
 typedef FakeSigninManager FakeSigninManagerForTesting;
 #endif
 
 #endif  // CHROME_BROWSER_SIGNIN_FAKE_SIGNIN_MANAGER_H_