Revert "Remove MediaStreamDescriptor and call/use WebMediaStream directly"

Source/core/platform/mediastream/RTCPeerConnectionHandlerClient.h

Index: Source/core/platform/mediastream/RTCPeerConnectionHandlerClient.h
diff --git a/Source/core/platform/mediastream/RTCPeerConnectionHandlerClient.h b/Source/core/platform/mediastream/RTCPeerConnectionHandlerClient.h
index 514e19ff2e89e97e6c214878fc5e5855a9ebcbae..03b2ea6129c8fdc7bb53924cb5d4b0c7cd451062 100644
--- a/Source/core/platform/mediastream/RTCPeerConnectionHandlerClient.h
+++ b/Source/core/platform/mediastream/RTCPeerConnectionHandlerClient.h
@@ -35,11 +35,11 @@
 
 namespace WebKit {
 class WebRTCICECandidate;
-class WebMediaStream;
 }
 
 namespace WebCore {
 
+class MediaStreamDescriptor;
 class RTCDataChannelHandler;
 
 class RTCPeerConnectionHandlerClient {
@@ -76,8 +76,8 @@ public:
     virtual void didChangeSignalingState(SignalingState) = 0;
     virtual void didChangeIceGatheringState(IceGatheringState) = 0;
     virtual void didChangeIceConnectionState(IceConnectionState) = 0;
-    virtual void didAddRemoteStream(WebKit::WebMediaStream) = 0;
-    virtual void didRemoveRemoteStream(WebKit::WebMediaStream) = 0;
+    virtual void didAddRemoteStream(PassRefPtr<MediaStreamDescriptor>) = 0;
+    virtual void didRemoveRemoteStream(MediaStreamDescriptor*) = 0;
     virtual void didAddRemoteDataChannel(PassOwnPtr<RTCDataChannelHandler>) = 0;
 };