Remove unused linked_ptr inclusion

components/signin/core/browser/about_signin_internals.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 COMPONENTS_SIGNIN_CORE_BROWSER_ABOUT_SIGNIN_INTERNALS_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_ABOUT_SIGNIN_INTERNALS_H_
 
 #include <map>
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
-#include "base/memory/linked_ptr.h"
 #include "base/observer_list.h"
 #include "base/values.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/signin/core/browser/gaia_cookie_manager_service.h"
 #include "components/signin/core/browser/signin_client.h"
 #include "components/signin/core/browser/signin_error_controller.h"
 #include "components/signin/core/browser/signin_internals_util.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "google_apis/gaia/oauth2_token_service.h"
 
@@ skipping 195 matching lines @@
   // Encapsulates the actual signin and token related values.
   // Most of the values are mirrored in the prefs for persistence.
   SigninStatus signin_status_;
 
   base::ObserverList<Observer> signin_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(AboutSigninInternals);
 };
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_ABOUT_SIGNIN_INTERNALS_H_