Fire a signal when the transport channel state changes

webrtc/p2p/base/faketransportcontroller.h

Index: webrtc/p2p/base/faketransportcontroller.h
diff --git a/webrtc/p2p/base/faketransportcontroller.h b/webrtc/p2p/base/faketransportcontroller.h
index 321537dd59be79b5e3efa2d9349f1c82c7c544a2..7f0d9693ec021dc05de9b84a8cff18c9086bb616 100644
--- a/webrtc/p2p/base/faketransportcontroller.h
+++ b/webrtc/p2p/base/faketransportcontroller.h
@@ -170,8 +170,10 @@ class FakeTransportChannel : public TransportChannelImpl,
     connection_count_ = connection_count;
     if (connection_count)
       had_connection_ = true;
+    // In this fake transport channel, |connection_count_| determines the
+    // transport channel state.
     if (connection_count_ < old_connection_count)
-      SignalConnectionRemoved(this);
+      SignalStateChanged(this);
   }
 
   void SetCandidatesGatheringComplete() {