components: Cleanup class/struct fwd declarations

components/sessions/content/content_live_tab.h

 // Copyright (c) 2011 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_SESSIONS_CONTENT_CONTENT_LIVE_TAB_H_
 #define COMPONENTS_SESSIONS_CONTENT_CONTENT_LIVE_TAB_H_
 
 #include "base/macros.h"
 #include "base/supports_user_data.h"
 #include "components/sessions/content/content_serialized_navigation_builder.h"
 #include "components/sessions/core/live_tab.h"
 #include "components/sessions/core/sessions_export.h"
 #include "content/public/browser/web_contents.h"
 
 namespace content {
 class NavigationController;
-class NavigationEntry;
-class SessionStorageNamespace;
 }
 
 class PersistentTabRestoreServiceTest;
 
 namespace sessions {
 
 // An implementation of LiveTab that is backed by content::WebContents for use
 // on //content-based platforms.
 class SESSIONS_EXPORT ContentLiveTab
     : public LiveTab,
@@ skipping 31 matching lines @@
   }
 
   content::WebContents* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentLiveTab);
 };
 
 }  // namespace sessions
 
 #endif  // COMPONENTS_SESSIONS_CONTENT_CONTENT_LIVE_TAB_H_