Clean up forward declarations in Source/web

Source/web/ChromeClientImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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.
@@ skipping 27 matching lines @@
 #include "platform/weborigin/KURL.h"
 #include "public/platform/WebColor.h"
 #include "public/web/WebNavigationPolicy.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 class AXObject;
 class ColorChooser;
 class ColorChooserClient;
 class Element;
-class Event;
 class FileChooser;
 class GraphicsLayerFactory;
 class HTMLFormControlElement;
 class HTMLInputElement;
 class KeyboardEvent;
 class PagePopup;
 class PagePopupClient;
 class PopupMenuClient;
-class RenderBox;
-class SecurityOrigin;
 class DateTimeChooser;
 class DateTimeChooserClient;
 class WebViewImpl;
 struct WebCursorInfo;
-struct WebPopupMenuInfo;
 struct WindowFeatures;
 
 // Handles window-level notifications from WebCore on behalf of a WebView.
 class ChromeClientImpl final : public ChromeClient {
 public:
     explicit ChromeClientImpl(WebViewImpl* webView);
     virtual ~ChromeClientImpl();
 
     virtual void* webView() const override;
 
@@ skipping 118 matching lines @@
     bool m_resizable;
 
     PagePopupDriver* m_pagePopupDriver;
 };
 
 DEFINE_TYPE_CASTS(ChromeClientImpl, ChromeClient, client, client->isChromeClientImpl(), client.isChromeClientImpl());
 
 } // namespace blink
 
 #endif