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

Source/web/NavigatorContentUtilsClientImpl.h

Index: Source/web/NavigatorContentUtilsClientImpl.h
diff --git a/Source/web/NavigatorContentUtilsClientImpl.h b/Source/web/NavigatorContentUtilsClientImpl.h
index 4005fdbeb4d1dc34db3985b3953158c8a89fa8b8..e8de7563da342eb1a92ec7ab2534290671096001 100644
--- a/Source/web/NavigatorContentUtilsClientImpl.h
+++ b/Source/web/NavigatorContentUtilsClientImpl.h
@@ -15,11 +15,11 @@ class WebViewImpl;
 class NavigatorContentUtilsClientImpl final : public NavigatorContentUtilsClient {
 public:
     static PassOwnPtr<NavigatorContentUtilsClientImpl> create(WebViewImpl*);
-    virtual ~NavigatorContentUtilsClientImpl() { }
+    ~NavigatorContentUtilsClientImpl() override { }
 
-    virtual void registerProtocolHandler(const String& scheme, const KURL&, const String& title) override;
-    virtual CustomHandlersState isProtocolHandlerRegistered(const String& scheme, const KURL&) override;
-    virtual void unregisterProtocolHandler(const String& scheme, const KURL&) override;
+    void registerProtocolHandler(const String& scheme, const KURL&, const String& title) override;
+    CustomHandlersState isProtocolHandlerRegistered(const String& scheme, const KURL&) override;
+    void unregisterProtocolHandler(const String& scheme, const KURL&) override;
 
 private:
     explicit NavigatorContentUtilsClientImpl(WebViewImpl*);