blink: Cleanup class/struct forward declarations

third_party/WebKit/Source/web/WebFrameWidgetImpl.h

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 33 matching lines @@
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebViewImpl.h"
 #include "wtf/Assertions.h"
 #include "wtf/HashSet.h"
 
 namespace blink {
 class Frame;
 class Element;
 class InspectorOverlay;
 class LocalFrame;
-class Page;
 class PaintLayerCompositor;
 class UserGestureToken;
 class CompositorAnimationTimeline;
 class WebLayer;
 class WebLayerTreeView;
 class WebMouseEvent;
 class WebMouseWheelEvent;
 class WebFrameWidgetImpl;
 
 using WebFrameWidgetsSet =
@@ skipping 176 matching lines @@
 
 DEFINE_TYPE_CASTS(WebFrameWidgetImpl,
                   WebFrameWidgetBase,
                   widget,
                   widget->forSubframe(),
                   widget.forSubframe());
 
 }  // namespace blink
 
 #endif