Merge 126107

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 168 matching lines @@
     //
     // The big problem though is that overflow needs to be region-specific. We can't simply use the RenderFlowThread's global
     // overflow values, since then we'd always think any narrow region had huge overflow (all the way to the width of the
     // RenderFlowThread itself).
     //
     // We'll need to expand RenderBoxRegionInfo to also hold left and right overflow values.
 }
 
 void RenderRegion::attachRegion()
 {
-    if (documentBeingDestroyed())
-        return;
-
+    ASSERT(view());
     if (!m_flowThread && isValid()) {
         // We have to recreate the named flow if the named flow was deleted because
         // the region detached was the last one from the named flow.
         m_flowThread = view()->flowThreadController()->ensureRenderFlowThreadWithName(style()->regionThread());
         // The region will be marked as valid after being checked that it is not
         // part of a circular dependency.
         setIsValid(false);
     }
 
     // By now the flow thread should already be added to the rendering tree,
@@ skipping 222 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