Revert of Remove scoped styles.

Source/core/css/resolver/ScopedStyleTree.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * 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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 29 matching lines @@
 {
     bool isNewEntry;
     ScopedStyleResolver* scopedStyleResolver = addScopedStyleResolver(scopingNode, isNewEntry);
     if (isNewEntry)
         setupScopedStylesTree(scopedStyleResolver);
     return scopedStyleResolver;
 }
 
 ScopedStyleResolver* ScopedStyleTree::scopedStyleResolverFor(const ContainerNode& scopingNode)
 {
-    if (!isShadowHost(&scopingNode)
+    if (!scopingNode.hasScopedHTMLStyleChild()
+        && !isShadowHost(&scopingNode)
         && !scopingNode.isDocumentNode()
         && !scopingNode.isShadowRoot())
         return 0;
     return lookupScopedStyleResolverFor(&scopingNode);
 }
 
 ScopedStyleResolver* ScopedStyleTree::addScopedStyleResolver(ContainerNode& scopingNode, bool& isNewEntry)
 {
     HashMap<const ContainerNode*, OwnPtr<ScopedStyleResolver> >::AddResult addResult = m_authorStyles.add(&scopingNode, nullptr);
 
@@ skipping 56 matching lines @@
 }
 
 void ScopedStyleTree::collectScopedResolversForHostedShadowTrees(const Element* element, Vector<ScopedStyleResolver*, 8>& resolvers)
 {
     ElementShadow* shadow = element->shadow();
     if (!shadow)
         return;
 
     // Adding scoped resolver for active shadow roots for shadow host styling.
     for (ShadowRoot* shadowRoot = shadow->youngestShadowRoot(); shadowRoot; shadowRoot = shadowRoot->olderShadowRoot()) {
-        if (shadowRoot->numberOfStyles() > 0) {
+        if (shadowRoot->hasScopedHTMLStyleChild()) {
             if (ScopedStyleResolver* resolver = scopedStyleResolverFor(*shadowRoot))
                 resolvers.append(resolver);
         }
     }
 }
 
 void ScopedStyleTree::resolveScopedKeyframesRules(const Element* element, Vector<ScopedStyleResolver*, 8>& resolvers)
 {
     Document& document = element->document();
     TreeScope& treeScope = element->treeScope();
@@ skipping 76 matching lines @@
         return;
 
     reparentNodes(resolverRemoved, resolverRemoved->parent());
     if (m_cache.scopedResolver == resolverRemoved)
         m_cache.clear();
 
     m_authorStyles.remove(scopingNode);
 }
 
 } // namespace WebCore