Revert of Remove scoped styles.

Source/core/dom/ContextFeatures.cpp

 /*
  * 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:
  *
  *     * 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 42 matching lines @@
     return instance;
 }
 
 bool ContextFeatures::dialogElementEnabled(Document* document)
 {
     if (!document)
         return RuntimeEnabledFeatures::dialogElementEnabled();
     return document->contextFeatures().isEnabled(document, DialogElement, RuntimeEnabledFeatures::dialogElementEnabled());
 }
 
+bool ContextFeatures::styleScopedEnabled(Document* document)
+{
+    if (!document)
+        return RuntimeEnabledFeatures::styleScopedEnabled();
+    return document->contextFeatures().isEnabled(document, StyleScoped, RuntimeEnabledFeatures::styleScopedEnabled());
+}
+
 bool ContextFeatures::pagePopupEnabled(Document* document)
 {
     if (!document)
         return false;
     return document->contextFeatures().isEnabled(document, PagePopup, false);
 }
 
 bool ContextFeatures::mutationEventsEnabled(Document* document)
 {
     ASSERT(document);
@@ skipping 14 matching lines @@
 
 void provideContextFeaturesToDocumentFrom(Document& document, Page& page)
 {
     ContextFeatures* provided = static_cast<ContextFeatures*>(ContextFeatures::SupplementType::from(page, ContextFeatures::supplementName()));
     if (!provided)
         return;
     document.setContextFeatures(*provided);
 }
 
 }