Bug 925226 - Fix incorrect downcast in signaling unittest. r=abr

media/webrtc/signaling/test/FakeMediaStreams.h

@@ -81,6 +81,7 @@ class Fake_MediaStream {
 
   virtual nsresult Start() { return NS_OK; }
   virtual nsresult Stop() { return NS_OK; }
+  virtual void StopStream() {}
 
   virtual void Periodic() {}
 
@@ -175,7 +176,7 @@ class Fake_SourceMediaStream : public Fake_MediaStream {
   void RemoveDirectListener(Fake_MediaStreamListener* aListener) {}
 
   //Don't pull anymore data,if mStop is true.
-  void StopStream() {
+  virtual void StopStream() {
    mStop = true;
   }
 
@@ -264,7 +265,6 @@ class Fake_MediaStreamBase : public Fake_MediaStream {
   virtual nsresult Start();
   virtual nsresult Stop();
 
-
   virtual int GetSegmentsAdded() {
     return mPeriodic->GetTimesCalled();
   }

media/webrtc/signaling/test/signaling_unittests.cpp

@@ -1027,7 +1027,7 @@ void CreateAnswer(sipcc::MediaConstraints& constraints, std::string offer,
   //Stops generating new audio data for transmission.
   //Should be called before Cleanup of the peer connection.
   void CloseSendStreams() {
-    static_cast<Fake_AudioStreamSource*>(
+    static_cast<Fake_MediaStream*>(
         domMediaStream_->GetStream())->StopStream();
   }