Use srcset's resource pixel density to determine intrinsic size

Source/core/rendering/RenderReplaced.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 27 matching lines @@
     bool hasReplacedLogicalWidth() const;
     bool hasReplacedLogicalHeight() const;
 
     virtual bool needsPreferredWidthsRecalculation() const OVERRIDE;
 
 protected:
     virtual void willBeDestroyed();
 
     virtual void layout();
 
-    virtual LayoutSize intrinsicSize() const OVERRIDE FINAL { return m_intrinsicSize; }
+    virtual LayoutSize intrinsicSize() const OVERRIDE { return m_intrinsicSize; }
     LayoutRect replacedContentRect(const LayoutSize* overriddenIntrinsicSize = 0) const;
     virtual void computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio, bool& isPercentageIntrinsicSize) const;
 
     virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE FINAL;
 
     virtual LayoutUnit minimumReplacedHeight() const { return LayoutUnit(); }
 
     virtual void setSelectionState(SelectionState) OVERRIDE FINAL;
 
     bool isSelected() const;
@@ skipping 25 matching lines @@
 
     virtual LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent = true) OVERRIDE FINAL;
     void computeAspectRatioInformationForRenderBox(RenderBox*, FloatSize& constrainedSize, double& intrinsicRatio, bool& isPercentageIntrinsicSize) const;
 
     mutable LayoutSize m_intrinsicSize;
 };
 
 }
 
 #endif