content: Cleanup class/struct forward declarations

content/browser/renderer_host/render_widget_host_delegate.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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/common/drag_event_source_info.h"
 #include "content/public/browser/renderer_unresponsive_type.h"
 #include "content/public/common/drop_data.h"
 #include "third_party/WebKit/public/platform/WebDisplayMode.h"
 #include "third_party/WebKit/public/platform/WebDragOperation.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace blink {
 class WebMouseWheelEvent;
 class WebGestureEvent;
 }
 
 namespace gfx {
 class Point;
-class Rect;
 class Size;
 }
 
 namespace content {
 
 class BrowserAccessibilityManager;
 class RenderWidgetHostImpl;
 class RenderWidgetHostInputEventRouter;
 class RenderViewHostDelegateView;
 class TextInputManager;
@@ skipping 196 matching lines @@
   virtual void FocusOwningWebContents(
       RenderWidgetHostImpl* render_widget_host) {}
 
  protected:
   virtual ~RenderWidgetHostDelegate() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_