Add support for dynamic channels in WebrtcTransport.

remoting/protocol/message_reader.cc

Index: remoting/protocol/message_reader.cc
diff --git a/remoting/protocol/message_reader.cc b/remoting/protocol/message_reader.cc
index c93b7a4edde6e6624cdbbec18c1a696fef5cf7ce..60c394019202a7252292f164fa3f983a863bd448 100644
--- a/remoting/protocol/message_reader.cc
+++ b/remoting/protocol/message_reader.cc
@@ -114,8 +114,9 @@ void MessageReader::OnDataReceived(net::IOBuffer* data, int data_size) {
 }
 
 void MessageReader::RunCallback(std::unique_ptr<CompoundBuffer> message) {
-  if (!message_received_callback_.is_null())
+  if (!message_received_callback_.is_null()) {
     message_received_callback_.Run(std::move(message));
+  }
 }
 
 }  // namespace protocol