Remove unused ExtraData support on exported mediastream objects.

Source/platform/mediastream/MediaStreamTrackSourcesRequest.h

 /*
  * Copyright (C) 2013 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 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef MediaStreamTrackSourcesRequest_h
 #define MediaStreamTrackSourcesRequest_h
 
 #include "platform/heap/Handle.h"
 #include "public/platform/WebVector.h"
 #include "wtf/Forward.h"
-#include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class WebSourceInfo;
 
 class MediaStreamTrackSourcesRequest : public GarbageCollectedFinalized<MediaStreamTrackSourcesRequest> {
 public:
-    class ExtraData {
-    public:
-        virtual ~ExtraData() { }
-    };
-
     virtual ~MediaStreamTrackSourcesRequest() { }
 
     virtual String origin() = 0;
     virtual void requestSucceeded(const WebVector<WebSourceInfo>&) = 0;
 
-    ExtraData* extraData() const { return m_extraData.get(); }
-    void setExtraData(PassOwnPtr<ExtraData> extraData) { m_extraData = extraData; }
-
-    // Need to eagerly finalize the ExtraData.
-    EAGERLY_FINALIZE();
     DEFINE_INLINE_VIRTUAL_TRACE() { }
 
 protected:
     MediaStreamTrackSourcesRequest() { }
-
-private:
-    OwnPtr<ExtraData> m_extraData;
 };
 
 } // namespace blink
 
 #endif // MediaStreamTrackSourcesRequest_h