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

Source/modules/mediasource/MediaSourceRegistry.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 52 matching lines @@
     RefPtr<MediaSource> source = iter->value;
     m_mediaSources.remove(iter);
 
     // Remove the pending activity added in registerMediaSourceURL().
     source->unsetPendingActivity(source.get());
 }
 
 MediaSource* MediaSourceRegistry::lookupMediaSource(const String& url)
 {
     ASSERT(isMainThread());
-    return m_mediaSources.get(url).get();
+    return m_mediaSources.get(url);
 }
 
 } // namespace WebCore