Update web classes to use OVERRIDE / FINAL when needed

Source/web/WebHelperPluginImpl.h

 /*
  * Copyright (C) 2012 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 32 matching lines @@
 
 class HelperPluginChromeClient;
 class HelperPluginFrameClient;
 class WebDocument;
 class WebFrameImpl;
 class WebViewImpl;
 class WebWidgetClient;
 
 // Hosts a simple page that instantiates a plugin using an <object> tag.
 // The widget is offscreen, and the plugin will not receive painting, resize, etc. events.
-class WebHelperPluginImpl : public WebHelperPlugin,
-                            public RefCounted<WebHelperPluginImpl> {
+class WebHelperPluginImpl FINAL : public WebHelperPlugin, public RefCounted<WebHelperPluginImpl> {
     WTF_MAKE_NONCOPYABLE(WebHelperPluginImpl);
     WTF_MAKE_FAST_ALLOCATED;
 
 public:
     virtual ~WebHelperPluginImpl();
     bool initialize(const String& pluginType, const WebDocument& hostDocument, WebViewImpl*);
     void closeHelperPlugin();
 
     // WebHelperPlugin methods:
     virtual void initializeFrame(WebFrameClient*) OVERRIDE;
@@ skipping 19 matching lines @@
 
     friend class WebHelperPlugin;
     friend class HelperPluginChromeClient;
 };
 
 DEFINE_TYPE_CASTS(WebHelperPluginImpl, WebWidget, widget, widget->isHelperPlugin(), widget.isHelperPlugin());
 
 } // namespace blink
 
 #endif // WebHelperPluginImpl_h