Remove most of scoped styles.

Source/core/css/resolver/ScopedStyleResolver.cpp

Index: Source/core/css/resolver/ScopedStyleResolver.cpp
diff --git a/Source/core/css/resolver/ScopedStyleResolver.cpp b/Source/core/css/resolver/ScopedStyleResolver.cpp
index e9693d0db983be5de1d7ef746151382d52539841..11a62da8e1089288b227555330a3fd4b2562c55c 100644
--- a/Source/core/css/resolver/ScopedStyleResolver.cpp
+++ b/Source/core/css/resolver/ScopedStyleResolver.cpp
@@ -45,26 +45,10 @@ 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)