HashTraits<RefPtr<P> >::PeekType should be raw pointer for better performance

Source/modules/mediastream/MediaStreamRegistry.cpp

 /*
  * Copyright (C) 2011 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 36 matching lines @@
 
 void MediaStreamRegistry::unregisterMediaStreamURL(const KURL& url)
 {
     ASSERT(isMainThread());
     m_streamDescriptors.remove(url.string());
 }
 
 MediaStreamDescriptor* MediaStreamRegistry::lookupMediaStreamDescriptor(const String& url)
 {
     ASSERT(isMainThread());
-    return m_streamDescriptors.get(url).get();
+    return m_streamDescriptors.get(url);
 }
 
 } // namespace WebCore