Fix lfiespan of ScopedStyleResolver

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 157 matching lines @@
     if (ShadowRoot* root = host()->containingShadowRoot()) {
         root->addChildShadowRoot();
         m_registeredWithParentShadowRoot = true;
     }
 
     return InsertionDone;
 }
 
 void ShadowRoot::removedFrom(ContainerNode* insertionPoint)
 {
-    if (insertionPoint->inDocument() && m_registeredWithParentShadowRoot) {
-        ShadowRoot* root = host()->containingShadowRoot();
-        if (!root)
-            root = insertionPoint->containingShadowRoot();
-        if (root)
-            root->removeChildShadowRoot();
-        m_registeredWithParentShadowRoot = false;
+    if (insertionPoint->inDocument()) {
+        if (ScopedStyleResolver* resolver = scopedStyleResolver())
+            insertionPoint->document().styleEngine()->removeScopedStyleResolver(resolver);
+
+        if (m_registeredWithParentShadowRoot) {
+            ShadowRoot* root = host()->containingShadowRoot();
+            if (!root)
+                root = insertionPoint->containingShadowRoot();
+            if (root)
+                root->removeChildShadowRoot();
+            m_registeredWithParentShadowRoot = false;
+        }
     }
 
     DocumentFragment::removedFrom(insertionPoint);
 }
 
 void ShadowRoot::childrenChanged(const ChildrenChange& change)
 {
     ContainerNode::childrenChanged(change);
 
     if (change.isChildElementChange())
@@ skipping 124 matching lines @@
 void ShadowRoot::trace(Visitor* visitor)
 {
     visitor->trace(m_prev);
     visitor->trace(m_next);
     visitor->trace(m_shadowRootRareData);
     TreeScope::trace(visitor);
     DocumentFragment::trace(visitor);
 }
 
 }