Cleanup: Remove forward declarations in various directories.

content/browser/renderer_host/render_view_host_delegate.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 CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/i18n/rtl.h"
 #include "base/memory/ref_counted.h"
 #include "base/process_util.h"
 #include "base/string16.h"
 #include "base/values.h"
 #include "content/common/content_export.h"
 #include "content/public/common/view_types.h"
 #include "content/public/common/window_container_type.h"
 #include "ipc/ipc_channel.h"
 #include "net/base/load_states.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPopupType.h"
 #include "webkit/glue/window_open_disposition.h"
 
-class BackgroundContents;
-class BookmarkNode;
 class GURL;
 class RenderViewHost;
 class SkBitmap;
 class TabContents;
 class WebKeyboardEvent;
 struct ContextMenuParams;
 struct NativeWebKeyboardEvent;
 struct ViewHostMsg_CreateWindow_Params;
 struct ViewHostMsg_FrameNavigate_Params;
 struct ViewHostMsg_RunFileChooser_Params;
@@ skipping 348 matching lines @@
   virtual void RequestToLockMouse() {}
 
   // Notification that the view has lost the mouse lock.
   virtual void LostMouseLock() {}
 
  protected:
   virtual ~RenderViewHostDelegate() {}
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_