Fix virtual/override/final usage in Source/core/{fetch,loader,streams,xmlhttprequest}/.

Source/core/loader/ImageLoader.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 43 matching lines @@
 class Element;
 class ImageLoader;
 class LayoutImageResource;
 
 template<typename T> class EventSender;
 typedef EventSender<ImageLoader> ImageEventSender;
 
 class CORE_EXPORT ImageLoader : public NoBaseWillBeGarbageCollectedFinalized<ImageLoader>, public ImageResourceClient {
 public:
     explicit ImageLoader(Element*);
-    virtual ~ImageLoader();
+    ~ImageLoader() override;
 
     // We must run the destructor in the eager sweeping phase and call
     // m_image->removeClient(this). Otherwise, the ImageResource can invoke
     // didAddClient() for the ImageLoader that is about to die in the current
     // lazy sweeping, and the didAddClient() can access on-heap objects that
     // have already been finalized in the current lazy sweeping.
     EAGERLY_FINALIZE();
     DECLARE_TRACE();
 
     enum UpdateFromElementBehavior {
@@ skipping 36 matching lines @@
     }
 
     void dispatchPendingEvent(ImageEventSender*);
 
     static void dispatchPendingLoadEvents();
     static void dispatchPendingErrorEvents();
 
     void addClient(ImageLoaderClient*);
     void removeClient(ImageLoaderClient*);
 
-    virtual bool getImageAnimationPolicy(ImageResource*, ImageAnimationPolicy&) override final;
+    bool getImageAnimationPolicy(ImageResource*, ImageAnimationPolicy&) final;
 protected:
-    virtual void notifyFinished(Resource*) override;
+    void notifyFinished(Resource*) override;
 
 private:
     class Task;
 
     // Called from the task or from updateFromElement to initiate the load.
     void doUpdateFromElement(BypassMainWorldBehavior, UpdateFromElementBehavior);
 
     virtual void dispatchLoadEvent() = 0;
     virtual void noImageResourceToLoad() { }
 
@@ skipping 58 matching lines @@
     bool m_imageComplete : 1;
     bool m_loadingImageDocument : 1;
     bool m_elementIsProtected : 1;
     bool m_suppressErrorEvents : 1;
     unsigned m_highPriorityClientCount;
 };
 
 }
 
 #endif