Remove viewportDefiningElement.

sky/engine/core/rendering/RenderBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. 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
@@ skipping 110 matching lines @@
     RenderBoxModelObject::updateFromStyle();
 
     RenderStyle* styleToUse = style();
     bool isRootObject = isDocumentElement();
     bool isViewObject = isRenderView();
 
     // The root and the RenderView always paint their backgrounds/borders.
     if (isRootObject || isViewObject)
         setHasBoxDecorationBackground(true);
 
-    bool boxHasOverflowClip = false;
-    if (!styleToUse->isOverflowVisible() && isRenderBlock() && !isViewObject) {
-        // If overflow has been propagated to the viewport, it has no effect here.
-        if (node() != document().viewportDefiningElement())
-            boxHasOverflowClip = true;
-    }
+    // TODO(esprehn): Why do we not want to set this on the RenderView?
+    if (isRenderBlock() && !isViewObject)
+        setHasOverflowClip(!styleToUse->isOverflowVisible());
 
-    setHasOverflowClip(boxHasOverflowClip);
     setHasTransform(styleToUse->hasTransformRelatedProperty());
 }
 
 void RenderBox::layout()
 {
     ASSERT(needsLayout());
 
     RenderObject* child = slowFirstChild();
     if (!child) {
         clearNeedsLayout();
@@ skipping 2806 matching lines @@
 
 RenderBox::BoxDecorationData::BoxDecorationData(const RenderStyle& style)
 {
     backgroundColor = style.colorIncludingFallback(CSSPropertyBackgroundColor);
     hasBackground = backgroundColor.alpha() || style.hasBackgroundImage();
     ASSERT(hasBackground == style.hasBackground());
     hasBorder = style.hasBorder();
 }
 
 } // namespace blink