Fix the float logic to not return an anonymous block ancestor

Source/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.
  *
  * 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
@@ skipping 168 matching lines @@
     ASSERT(isFloatingOrOutOfFlowPositioned());
 
     if (documentBeingDestroyed())
         return;
 
     if (isFloating()) {
         RenderBlock* parentBlock = 0;
         for (RenderObject* curr = parent(); curr && !curr->isRenderView(); curr = curr->parent()) {
             if (curr->isRenderBlock()) {
                 RenderBlock* currBlock = toRenderBlock(curr);
-                if (!parentBlock || currBlock->containsFloat(this))
+                if (!parentBlock || parentBlock->isAnonymousBlock() || currBlock->containsFloat(this))
                     parentBlock = currBlock;
             }
         }
 
         if (parentBlock) {
             RenderObject* parent = parentBlock->parent();
             if (parent && parent->isFlexibleBoxIncludingDeprecated())
                 parentBlock = toRenderBlock(parent);
 
             parentBlock->markSiblingsWithFloatsForLayout(this);
@@ skipping 4378 matching lines @@
 
 void RenderBox::reportStaticMembersMemoryUsage(MemoryInstrumentation* memoryInstrumentation)
 {
     memoryInstrumentation->addRootObject(gOverrideHeightMap, WebCoreMemoryTypes::RenderingStructures);
     memoryInstrumentation->addRootObject(gOverrideWidthMap, WebCoreMemoryTypes::RenderingStructures);
     memoryInstrumentation->addRootObject(gOverrideContainingBlockLogicalHeightMap, WebCoreMemoryTypes::RenderingStructures);
     memoryInstrumentation->addRootObject(gOverrideContainingBlockLogicalWidthMap, WebCoreMemoryTypes::RenderingStructures);
 }
 
 } // namespace WebCore