Update comments for removal of MediaController.

webrtc/media/base/mediachannel.h

Index: webrtc/media/base/mediachannel.h
diff --git a/webrtc/media/base/mediachannel.h b/webrtc/media/base/mediachannel.h
index 6f14b7aa2e5ec95c53d873feb0a6bbbf3ed56d06..dadb55bfdbae513e4bea0e255ecb377e7faf73b2 100644
--- a/webrtc/media/base/mediachannel.h
+++ b/webrtc/media/base/mediachannel.h
@@ -92,8 +92,7 @@ static T MinPositive(T a, T b) {
   return std::min(a, b);
 }
 
-// Construction-time settings, passed to
-// MediaControllerInterface::Create, and passed on when creating
+// Construction-time settings, passed on when creating
 // MediaChannels.
 struct MediaConfig {
   // Set DSCP value on packets. This flag comes from the