content: Cleanup class/struct forward declarations

content/public/browser/web_contents_view_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_PUBLIC_BROWSER_WEB_CONTENTS_VIEW_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_VIEW_DELEGATE_H_
 
 #if defined(__OBJC__)
 #import <Cocoa/Cocoa.h>
 #endif
 
 #include "base/callback_forward.h"
 #include "content/common/content_export.h"
 #include "ui/gfx/native_widget_types.h"
 
 #if defined(__OBJC__)
 @protocol RenderWidgetHostViewMacDelegate;
 #endif
 
 namespace gfx {
-class Rect;
 class Size;
 }
 
-namespace ui {
-class GestureEvent;
-class MouseEvent;
-}
-
 namespace content {
 class RenderFrameHost;
 class RenderWidgetHost;
 class WebDragDestDelegate;
 struct ContextMenuParams;
 
 // This interface allows a client to extend the functionality of the
 // WebContentsView implementation.
 class CONTENT_EXPORT WebContentsViewDelegate {
  public:
@@ skipping 27 matching lines @@
           RenderWidgetHost* render_widget_host);
 #else
   virtual void* CreateRenderWidgetHostViewDelegate(
       RenderWidgetHost* render_widget_host);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_VIEW_DELEGATE_H_