Remove unused ExtraData support on exported mediastream objects.

public/platform/WebMediaStreamTrackSourcesRequest.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 21 matching lines @@
 #include "WebString.h"
 #include "WebVector.h"
 
 namespace blink {
 
 class MediaStreamTrackSourcesRequest;
 class WebSourceInfo;
 
 class WebMediaStreamTrackSourcesRequest {
 public:
-    class ExtraData {
-    public:
-        virtual ~ExtraData() { }
-    };
-
     WebMediaStreamTrackSourcesRequest() { }
     WebMediaStreamTrackSourcesRequest(const WebMediaStreamTrackSourcesRequest& other) { assign(other); }
     ~WebMediaStreamTrackSourcesRequest() { reset(); }
 
     WebMediaStreamTrackSourcesRequest& operator=(const WebMediaStreamTrackSourcesRequest& other)
     {
         assign(other);
         return *this;
     }
 
     BLINK_PLATFORM_EXPORT void assign(const WebMediaStreamTrackSourcesRequest&);
 
     BLINK_PLATFORM_EXPORT void reset();
     bool isNull() const { return m_private.isNull(); }
 
     BLINK_PLATFORM_EXPORT WebString origin() const;
     BLINK_PLATFORM_EXPORT void requestSucceeded(const WebVector<WebSourceInfo>&) const;
 
-    // Extra data associated with this object.
-    // If non-null, the extra data pointer will be deleted when the object is destroyed.
-    // Setting the extra data pointer will cause any existing non-null
-    // extra data pointer to be deleted.
-    BLINK_PLATFORM_EXPORT ExtraData* extraData() const;
-    BLINK_PLATFORM_EXPORT void setExtraData(ExtraData*);
-
 #if INSIDE_BLINK
     BLINK_PLATFORM_EXPORT WebMediaStreamTrackSourcesRequest(MediaStreamTrackSourcesRequest*);
 #endif
 
 private:
     WebPrivatePtr<MediaStreamTrackSourcesRequest> m_private;
 };
 
 } // namespace blink
 
 #endif // WebMediaStreamTrackSourcesRequest_h