Revert of Remove scoped styles.

Source/web/ContextFeaturesClientImpl.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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 126 matching lines @@
     ContextFeaturesCache::from(*document).validateAgainst(document);
 }
 
 bool ContextFeaturesClientImpl::askIfIsEnabled(Document* document, ContextFeatures::FeatureType type, bool defaultValue)
 {
     WebLocalFrameImpl* frame = WebLocalFrameImpl::fromFrame(document->frame());
     if (!frame || !frame->permissionClient())
         return defaultValue;
 
     switch (type) {
+    case ContextFeatures::StyleScoped:
+        return frame->permissionClient()->allowWebComponents(defaultValue);
     case ContextFeatures::MutationEvents:
         return frame->permissionClient()->allowMutationEvents(defaultValue);
     case ContextFeatures::PushState:
         return frame->permissionClient()->allowPushState();
     default:
         return defaultValue;
     }
 }
 
 } // namespace blink