Cleanup: Remove unneeded forward declarations in webkit/plugins/.

webkit/plugins/npapi/webplugin_page_delegate.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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 WEBKIT_PLUGINS_NPAPI_WEBPLUGIN_PAGE_DELEGATE_
-#define WEBKIT_PLUGINS_NPAPI_WEBPLUGIN_PAGE_DELEGATE_
+#ifndef WEBKIT_PLUGINS_NPAPI_WEBPLUGIN_PAGE_DELEGATE_H_
+#define WEBKIT_PLUGINS_NPAPI_WEBPLUGIN_PAGE_DELEGATE_H_
+
+#include <string>
 
 #include "ui/gfx/native_widget_types.h"
 
 class FilePath;
-class GURL;
 
 namespace WebKit {
 class WebCookieJar;
 }
 
 namespace webkit {
 namespace npapi {
 
 class WebPluginDelegate;
 struct WebPluginGeometry;
@@ skipping 31 matching lines @@
   virtual void DidStopLoadingForPlugin() = 0;
 
   // The WebCookieJar to use for this plugin.
   virtual WebKit::WebCookieJar* GetCookieJar() = 0;
 };
 
 }  // namespace npapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_NPAPI_WEBPLUGIN_PAGE_DELEGATE_H_