Revert "Remove MediaStreamDescriptor and call/use WebMediaStream directly"

Source/core/platform/mediastream/RTCStatsRequest.h

 /*
  * 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:
  *
  * 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
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef RTCStatsRequest_h
 #define RTCStatsRequest_h
 
 #include <wtf/PassRefPtr.h>
 #include <wtf/RefCounted.h>
 #include <wtf/text/WTFString.h>
 
-namespace WebKit {
-class WebMediaStream;
-}
-
 namespace WebCore {
 
 class MediaStreamComponent;
+class MediaStreamDescriptor;
 class RTCStatsResponseBase;
 
 class RTCStatsRequest : public RefCounted<RTCStatsRequest> {
 public:
     virtual ~RTCStatsRequest() { }
 
     virtual PassRefPtr<RTCStatsResponseBase> createResponse() = 0;
     virtual bool hasSelector() = 0;
-    virtual WebKit::WebMediaStream stream() = 0;
+    virtual MediaStreamDescriptor* stream() = 0;
     virtual MediaStreamComponent* component() = 0;
     virtual void requestSucceeded(PassRefPtr<RTCStatsResponseBase>) = 0;
 
 protected:
     RTCStatsRequest() { }
 };
 
 } // namespace WebCore
 
 #endif // RTCStatsRequest_h