content: Cleanup class/struct forward declarations

content/renderer/render_view_impl.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 CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 55 matching lines @@
 #endif
 
 #if defined(COMPILER_MSVC)
 // RenderViewImpl is a diamond-shaped hierarchy, with WebWidgetClient at the
 // root. VS warns when we inherit the WebWidgetClient method implementations
 // from RenderWidget.  It's safe to ignore that warning.
 #pragma warning(disable: 4250)
 #endif
 
 namespace blink {
-class WebApplicationCacheHost;
 class WebDataSource;
 class WebDateTimeChooserCompletion;
 class WebGestureEvent;
 class WebIconURL;
-class WebImage;
 class WebMouseEvent;
 class WebSpeechRecognizer;
 class WebStorageNamespace;
 class WebURLRequest;
 struct WebActiveWheelFlingParameters;
 struct WebDateTimeChooserParams;
 struct WebMediaPlayerAction;
 struct WebPluginAction;
 struct WebPoint;
 struct WebWindowFeatures;
@@ skipping 762 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_