chrome: Cleanup class/struct forward declarations

chrome/browser/sessions/session_service.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_SESSIONS_SESSION_SERVICE_H_
 #define CHROME_BROWSER_SESSIONS_SESSION_SERVICE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 14 matching lines @@
 #include "components/sessions/core/base_session_service_delegate.h"
 #include "components/sessions/core/session_service_commands.h"
 #include "components/sessions/core/tab_restore_service_client.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/base/ui_base_types.h"
 
 class Profile;
 
 namespace content {
-class NavigationEntry;
 class WebContents;
 }  // namespace content
 
 namespace sessions {
 class SessionCommand;
 struct SessionTab;
 struct SessionWindow;
 }  // namespace sessions
 
 // SessionService ------------------------------------------------------------
@@ skipping 356 matching lines @@
   // For browser_tests, since we want to simulate the browser shutting down
   // without quitting.
   bool force_browser_not_alive_with_no_windows_;
 
   base::WeakPtrFactory<SessionService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionService);
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_SESSION_SERVICE_H_