Fix virtual/override/final usage in Source/web/.

Source/web/WebDevToolsFrontendImpl.h

 /*
  * Copyright (C) 2010 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 29 matching lines @@
 
 namespace blink {
 
 class DevToolsHost;
 class WebLocalFrameImpl;
 
 class WebDevToolsFrontendImpl final : public WebDevToolsFrontend, public InspectorFrontendClient {
     WTF_MAKE_NONCOPYABLE(WebDevToolsFrontendImpl);
 public:
     WebDevToolsFrontendImpl(WebLocalFrameImpl*, WebDevToolsFrontendClient*);
-    virtual ~WebDevToolsFrontendImpl();
+    ~WebDevToolsFrontendImpl() override;
 
     void didClearWindowObject(WebLocalFrameImpl*);
 
     void sendMessageToBackend(const WTF::String&) override;
 
     void sendMessageToEmbedder(const WTF::String&) override;
 
     bool isUnderTest() override;
 
     void showContextMenu(LocalFrame*, float x, float y, PassRefPtrWillBeRawPtr<ContextMenuProvider>) override;
 
     void setInjectedScriptForOrigin(const String& origin, const String& source) override;
 
 private:
     WebLocalFrameImpl* m_webFrame;
     WebDevToolsFrontendClient* m_client;
     RefPtrWillBePersistent<DevToolsHost> m_devtoolsHost;
     typedef HashMap<String, String> InjectedScriptForOriginMap;
     InjectedScriptForOriginMap m_injectedScriptForOrigin;
 };
 
 } // namespace blink
 
 #endif