Element::recalcStyle() overly reattach()-es InsertionPoints.

Source/core/dom/shadow/ElementShadow.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 56 matching lines @@
         oldRoot->setPrev(0);
         oldRoot->setNext(0);
         ChildNodeRemovalNotifier(shadowHost).notify(oldRoot.get());
     }
 
     m_distributor.invalidateDistribution(shadowHost);
 }
 
 void ElementShadow::attach()
 {
-    ContentDistributor::ensureDistribution(youngestShadowRoot());
+    ContentDistributor::ensureDistribution(host());
 
     for (ShadowRoot* root = youngestShadowRoot(); root; root = root->olderShadowRoot()) {
         if (!root->attached())
             root->attach();
     }
 }
 
 void ElementShadow::detach()
 {
     for (ShadowRoot* root = youngestShadowRoot(); root; root = root->olderShadowRoot()) {
@@ skipping 42 matching lines @@
     info.addMember(m_shadowRoots, "shadowRoots");
     ShadowRoot* shadowRoot = m_shadowRoots.head();
     while (shadowRoot) {
         info.addMember(shadowRoot, "shadowRoot");
         shadowRoot = shadowRoot->next();
     }
     info.addMember(m_distributor, "distributor");
 }
 
 } // namespace