Remove the composite attribute on <img>

Source/core/html/HTMLImageElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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 40 matching lines @@
     int height(bool ignorePendingStylesheets = false);
 
     int naturalWidth() const;
     int naturalHeight() const;
     const String& currentSrc() const;
 
     bool isServerMap() const;
 
     const AtomicString& altText() const;
 
-    CompositeOperator compositeOperator() const { return m_compositeOperator; }
-
     ImageResource* cachedImage() const { return imageLoader().image(); }
     void setImageResource(ImageResource* i) { imageLoader().setImage(i); };
 
     void setLoadingImageDocument() { imageLoader().setLoadingImageDocument(); }
 
     void setHeight(int);
 
     KURL src() const;
     void setSrc(const String&);
 
@@ skipping 62 matching lines @@
     void notifyViewportChanged();
     void createMediaQueryListIfDoesNotExist();
 
     OwnPtrWillBeMember<HTMLImageLoader> m_imageLoader;
     RefPtrWillBeMember<ViewportChangeListener> m_listener;
 #if ENABLE(OILPAN)
     Member<HTMLFormElement> m_form;
 #else
     WeakPtr<HTMLFormElement> m_form;
 #endif
-    CompositeOperator m_compositeOperator;
     AtomicString m_bestFitImageURL;
     float m_imageDevicePixelRatio;
     unsigned m_formWasSetByParser : 1;
     unsigned m_elementCreatedByParser : 1;
     // Intrinsic sizing is viewport dependant if the 'w' descriptor was used for the picked resource.
     unsigned m_intrinsicSizingViewportDependant : 1;
 };
 
 } // namespace blink
 
 #endif // HTMLImageElement_h