Cleanup some forward declared structs that are not being used.

chrome/browser/renderer_host/render_widget_host.h

 // Copyright (c) 2006-2008 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_RENDERER_HOST_RENDER_WIDGET_HOST_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
 
 #include <vector>
 
 #include "base/gfx/size.h"
@@ skipping 10 matching lines @@
 class PaintObserver;
 class RenderProcessHost;
 class RenderWidgetHostView;
 class WebInputEvent;
 class WebKeyboardEvent;
 class WebMouseEvent;
 class WebMouseWheelEvent;
 class WebCursor;
 struct ViewHostMsg_PaintRect_Params;
 struct ViewHostMsg_ScrollRect_Params;
-struct WebPluginGeometry;
 
 // This class manages the browser side of a browser<->renderer HWND connection.
 // The HWND lives in the browser process, and windows events are sent over
 // IPC to the corresponding object in the renderer.  The renderer paints into
 // shared memory, which we transfer to a backing store and blit to the screen
 // when Windows sends us a WM_PAINT message.
 //
 // How Shutdown Works
 //
 // There are two situations in which this object, a RenderWidgetHost, can be
@@ skipping 298 matching lines @@
   bool view_being_painted_;
 
   // Used for UMA histogram logging to measure the time for a repaint view
   // operation to finish.
   base::TimeTicks repaint_start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_