Fix virtual/override/final usage in the rest of Source/core/.

Source/core/imagebitmap/ImageBitmapFactories.h

 /*
  * Copyright (c) 2013, 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 63 matching lines @@
         static ImageBitmapLoader* create(ImageBitmapFactories& factory, const IntRect& cropRect, ScriptState* scriptState)
         {
             return new ImageBitmapLoader(factory, cropRect, scriptState);
         }
 
         void loadBlobAsync(ExecutionContext*, Blob*);
         ScriptPromise promise() { return m_resolver->promise(); }
 
         DECLARE_TRACE();
 
-        virtual ~ImageBitmapLoader() { }
+        ~ImageBitmapLoader() override { }
 
     private:
         ImageBitmapLoader(ImageBitmapFactories&, const IntRect&, ScriptState*);
 
         void rejectPromise();
 
         // FileReaderLoaderClient
-        virtual void didStartLoading() override { }
-        virtual void didReceiveData() override { }
-        virtual void didFinishLoading() override;
-        virtual void didFail(FileError::ErrorCode) override;
+        void didStartLoading() override { }
+        void didReceiveData() override { }
+        void didFinishLoading() override;
+        void didFail(FileError::ErrorCode) override;
 
         FileReaderLoader m_loader;
         RawPtrWillBeMember<ImageBitmapFactories> m_factory;
         RefPtrWillBeMember<ScriptPromiseResolver> m_resolver;
         IntRect m_cropRect;
     };
 
     static ImageBitmapFactories& from(EventTarget&);
 
     template<class GlobalObject>
     static ImageBitmapFactories& fromInternal(GlobalObject&);
 
     void addLoader(ImageBitmapLoader*);
     void didFinishLoading(ImageBitmapLoader*);
 
     PersistentHeapHashSetWillBeHeapHashSet<Member<ImageBitmapLoader>> m_pendingLoaders;
 };
 
 } // namespace blink
 
 #endif // ImageBitmapFactories_h