Revert "Remove MediaStreamDescriptor and call/use WebMediaStream directly"

Source/modules/mediastream/UserMediaRequest.h

Index: Source/modules/mediastream/UserMediaRequest.h
diff --git a/Source/modules/mediastream/UserMediaRequest.h b/Source/modules/mediastream/UserMediaRequest.h
index e185055efad0368a88cf3187687d544a7fe0fc3c..c539b1bb19503c57570fa21bdb72481f3109c000 100644
--- a/Source/modules/mediastream/UserMediaRequest.h
+++ b/Source/modules/mediastream/UserMediaRequest.h
@@ -41,16 +41,13 @@
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
-namespace WebKit {
-class WebMediaStream;
-}
-
 namespace WebCore {
 
 class Dictionary;
 class Document;
 class MediaConstraints;
 class MediaConstraintsImpl;
+class MediaStreamDescriptor;
 class UserMediaController;
 
 class UserMediaRequest : public MediaStreamSourcesQueryClient, public ContextDestructionObserver {
@@ -64,7 +61,7 @@ public:
 
     void start();
 
-    void succeed(WebKit::WebMediaStream);
+    void succeed(PassRefPtr<MediaStreamDescriptor>);
     void fail(const String& description);
     void failConstraint(const String& constraintName, const String& description);