Remove the composite attribute on <img>

Source/core/html/HTMLImageElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 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 62 matching lines @@
         MediaQueryListListener::trace(visitor);
     }
 private:
     explicit ViewportChangeListener(HTMLImageElement* element) : m_element(element) { }
     RawPtrWillBeMember<HTMLImageElement> m_element;
 };
 
 HTMLImageElement::HTMLImageElement(Document& document, HTMLFormElement* form, bool createdByParser)
     : HTMLElement(imgTag, document)
     , m_imageLoader(HTMLImageLoader::create(this))
-    , m_compositeOperator(CompositeSourceOver)
     , m_imageDevicePixelRatio(1.0f)
     , m_formWasSetByParser(false)
     , m_elementCreatedByParser(createdByParser)
     , m_intrinsicSizingViewportDependant(false)
 {
     if (form && form->inDocument()) {
 #if ENABLE(OILPAN)
         m_form = form;
 #else
         m_form = form->createWeakPtr();
@@ skipping 142 matching lines @@
 
 void HTMLImageElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == altAttr) {
         if (renderer() && renderer()->isImage())
             toRenderImage(renderer())->updateAltText();
     } else if (name == srcAttr || name == srcsetAttr || name == sizesAttr) {
         selectSourceURL(ImageLoader::UpdateIgnorePreviousError);
     } else if (name == usemapAttr) {
         setIsLink(!value.isNull());
-    } else if (name == compositeAttr) {
-        blink::WebBlendMode blendOp = blink::WebBlendModeNormal;
-        if (!parseCompositeAndBlendOperator(value, m_compositeOperator, blendOp))
-            m_compositeOperator = CompositeSourceOver;
-        else if (m_compositeOperator != CompositeSourceOver)
-            UseCounter::count(document(), UseCounter::HTMLImageElementComposite);
     } else {
         HTMLElement::parseAttribute(name, value);
     }
 }
 
 const AtomicString& HTMLImageElement::altText() const
 {
     // lets figure out the alt text.. magic stuff
     // http://www.w3.org/TR/1998/REC-html40-19980424/appendix/notes.html#altgen
     // also heavily discussed by Hixie on bugzilla
@@ skipping 391 matching lines @@
     }
     imageLoader().updateFromElement(behavior);
 }
 
 const KURL& HTMLImageElement::sourceURL() const
 {
     return cachedImage()->response().url();
 }
 
 }