Remove the composite attribute on <img>

Source/core/paint/ImagePainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/ImagePainter.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/editing/FrameSelection.h"
@@ skipping 164 matching lines @@
 void ImagePainter::paintIntoRect(GraphicsContext* context, const LayoutRect& rect)
 {
     IntRect alignedRect = pixelSnappedIntRect(rect);
     if (!m_renderImage.imageResource()->hasImage() || m_renderImage.imageResource()->errorOccurred() || alignedRect.width() <= 0 || alignedRect.height() <= 0)
         return;
 
     RefPtr<Image> img = m_renderImage.imageResource()->image(alignedRect.width(), alignedRect.height());
     if (!img || img->isNull())
         return;
 
-    HTMLImageElement* imageElt = isHTMLImageElement(m_renderImage.node()) ? toHTMLImageElement(m_renderImage.node()) : 0;
-    CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver;
     Image* image = img.get();
     InterpolationQuality interpolationQuality = BoxPainter::chooseInterpolationQuality(m_renderImage, context, image, image, alignedRect.size());
 
     TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "PaintImage", "data", InspectorPaintImageEvent::data(m_renderImage));
     // FIXME(361045): remove InspectorInstrumentation calls once DevTools Timeline migrates to tracing.
     InspectorInstrumentation::willPaintImage(&m_renderImage);
     InterpolationQuality previousInterpolationQuality = context->imageInterpolationQuality();
     context->setImageInterpolationQuality(interpolationQuality);
-    context->drawImage(image, alignedRect, compositeOperator, m_renderImage.shouldRespectImageOrientation());
+    context->drawImage(image, alignedRect, CompositeSourceOver, m_renderImage.shouldRespectImageOrientation());
     context->setImageInterpolationQuality(previousInterpolationQuality);
     InspectorInstrumentation::didPaintImage(&m_renderImage);
 }
 
 } // namespace blink