components: Cleanup class/struct fwd declarations

components/plugins/renderer/webview_plugin.h

 // Copyright 2013 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 COMPONENTS_PLUGINS_RENDERER_WEBVIEW_PLUGIN_H_
 #define COMPONENTS_PLUGINS_RENDERER_WEBVIEW_PLUGIN_H_
 
 #include <list>
 #include <memory>
 
 #include "base/memory/weak_ptr.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "third_party/WebKit/public/platform/WebCursorInfo.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURLResponse.h"
 #include "third_party/WebKit/public/web/WebFrameClient.h"
 #include "third_party/WebKit/public/web/WebKit.h"
 #include "third_party/WebKit/public/web/WebPlugin.h"
 #include "third_party/WebKit/public/web/WebViewClient.h"
 
 namespace blink {
-class WebFrameWidget;
 class WebMouseEvent;
 }
 
 namespace content {
 class RenderView;
 struct WebPreferences;
 }
 
-namespace gfx {
-class Size;
-}
-
 // This class implements the WebPlugin interface by forwarding drawing and
 // handling input events to a WebView.
 // It can be used as a placeholder for an actual plugin, using HTML for the UI.
 // To show HTML data inside the WebViewPlugin,
 // call web_view->mainFrame()->loadHTMLString() with the HTML data and a fake
 // chrome:// URL as origin.
 
 class WebViewPlugin : public blink::WebPlugin,
                       public blink::WebViewClient,
                       public content::RenderViewObserver {
@@ skipping 125 matching lines @@
    private:
     WebViewPlugin* plugin_;
   };
   PluginWebFrameClient web_frame_client_;
 
   // Should be invalidated when destroy() is called.
   base::WeakPtrFactory<WebViewPlugin> weak_factory_;
 };
 
 #endif  // COMPONENTS_PLUGINS_RENDERER_WEBVIEW_PLUGIN_H_