WIP: Move StyleEngine::m_activeTreeScopes to TreeScope::m_childTreeScopesWithActiveStyleSheets

Source/core/dom/shadow/ShadowRoot.cpp

 /*
  * Copyright (C) 2011 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 172 matching lines @@
         if (m_registeredWithParentShadowRoot) {
             ShadowRoot* root = host()->containingShadowRoot();
             if (!root)
                 root = insertionPoint->containingShadowRoot();
             if (root)
                 root->removeChildShadowRoot();
             m_registeredWithParentShadowRoot = false;
         }
     }
 
+    if (isInActiveStyleSheetsTraversal())
+        removeFromActiveStyleSheetsTraversal();
+
     DocumentFragment::removedFrom(insertionPoint);
 }
 
 void ShadowRoot::childrenChanged(const ChildrenChange& change)
 {
     ContainerNode::childrenChanged(change);
 
     if (change.isChildElementChange())
         checkForSiblingStyleChanges(change.type == ElementRemoved ? SiblingElementRemoved : SiblingElementInserted, change.siblingBeforeChange, change.siblingAfterChange);
 
@@ skipping 122 matching lines @@
 DEFINE_TRACE(ShadowRoot)
 {
     visitor->trace(m_prev);
     visitor->trace(m_next);
     visitor->trace(m_shadowRootRareData);
     TreeScope::trace(visitor);
     DocumentFragment::trace(visitor);
 }
 
 }