Remove most of scoped styles.

Source/core/css/resolver/ScopedStyleResolver.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 27 matching lines @@
 #include "core/dom/Document.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLStyleElement.h"
 
 namespace WebCore {
 
 ContainerNode* ScopedStyleResolver::scopingNodeFor(Document& document, const CSSStyleSheet* sheet)
 {
     ASSERT(sheet);
-
-    Document* sheetDocument = sheet->ownerDocument();
-    if (!sheetDocument)
-        return 0;
     Node* ownerNode = sheet->ownerNode();
     if (!isHTMLStyleElement(ownerNode))
         return &document;
-
-    HTMLStyleElement& styleElement = toHTMLStyleElement(*ownerNode);
-    if (!styleElement.scoped()) {
-        if (styleElement.isInShadowTree())
-            return styleElement.containingShadowRoot();
-        return &document;
-    }
-
-    ContainerNode* parent = styleElement.parentNode();
-    if (!parent)
-        return 0;
-
-    return (parent->isElementNode() || parent->isShadowRoot()) ? parent : 0;
+    return toHTMLStyleElement(*ownerNode).scopingNode();
 }
 
 void ScopedStyleResolver::addRulesFromSheet(CSSStyleSheet* cssSheet, const MediaQueryEvaluator& medium, StyleResolver* resolver)
 {
     m_authorStyleSheets.append(cssSheet);
     StyleSheetContents* sheet = cssSheet->contents();
 
     AddRuleFlags addRuleFlags = resolver->document().securityOrigin()->canRequest(sheet->baseURL()) ? RuleHasDocumentSecurityOrigin : RuleHasNoSpecialState;
     const RuleSet& ruleSet = sheet->ensureRuleSet(medium, addRuleFlags);
     resolver->addMediaQueryResults(ruleSet.viewportDependentMediaQueryResults());
@@ skipping 71 matching lines @@
 
 void ScopedStyleResolver::collectViewportRulesTo(StyleResolver* resolver) const
 {
     if (!m_scopingNode.isDocumentNode())
         return;
     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i)
         resolver->viewportStyleResolver()->collectViewportRules(&m_authorStyleSheets[i]->contents()->ruleSet(), ViewportStyleResolver::AuthorOrigin);
 }
 
 } // namespace WebCore