Merge 126048

Source/WebCore/rendering/RenderRegion.cpp

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 335 matching lines @@
     m_renderObjectRegionStyle.swap(temp);
 }
 
 void RenderRegion::insertedIntoTree()
 {
     RenderReplaced::insertedIntoTree();
 
     attachRegion();
 }
 
+void RenderRegion::willBeRemovedFromTree()
+{
+    RenderReplaced::willBeRemovedFromTree();
+
+    detachRegion();
+}
+
 PassRefPtr<RenderStyle> RenderRegion::computeStyleInRegion(const RenderObject* object)
 {
     ASSERT(object);
     ASSERT(object->view());
     ASSERT(object->view()->document());
     ASSERT(!object->isAnonymous());
     ASSERT(object->node() && object->node()->isElementNode());
 
     Element* element = toElement(object->node());
     RefPtr<RenderStyle> renderObjectRegionStyle = object->view()->document()->styleResolver()->styleForElement(element, 0, DisallowStyleSharing, MatchAllRules, this);
@@ skipping 51 matching lines @@
 {
     ASSERT(object);
     m_renderObjectRegionStyle.remove(object);
 
     // Clear the style for the children of this object.
     for (RenderObject* child = object->firstChild(); child; child = child->nextSibling())
         clearObjectStyleInRegion(child);
 }
 
 } // namespace WebCore