Remove unused linked_ptr inclusion

components/login/screens/screen_context.h

 // Copyright (c) 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 COMPONENTS_LOGIN_SCREENS_SCREEN_CONTEXT_H_
 #define COMPONENTS_LOGIN_SCREENS_SCREEN_CONTEXT_H_
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/macros.h"
-#include "base/memory/linked_ptr.h"
 #include "base/strings/string16.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/values.h"
 #include "components/login/base_screen_handler_utils.h"
 #include "components/login/login_export.h"
 
 namespace login {
 
 // ScreenContext is a key-value storage for values that are shared
 // between C++ and JS sides. Objects of this class should be used in
@@ skipping 96 matching lines @@
 
   // Contains all pending changes.
   base::DictionaryValue changes_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenContext);
 };
 
 }  // namespace login
 
 #endif  // COMPONENTS_LOGIN_SCREENS_SCREEN_CONTEXT_H_