Simplify data channel creation logic in WebRTC-based protocol

remoting/protocol/connection_tester.cc

Index: remoting/protocol/connection_tester.cc
diff --git a/remoting/protocol/connection_tester.cc b/remoting/protocol/connection_tester.cc
index 214f6ea13a95b68091698581f3f146f4b32ed4ef..32f336888aaab2b4786d4adff1ec73bd71b7f56b 100644
--- a/remoting/protocol/connection_tester.cc
+++ b/remoting/protocol/connection_tester.cc
@@ -273,7 +273,9 @@ MessagePipeConnectionTester::~MessagePipeConnectionTester() {}
 
 void MessagePipeConnectionTester::RunAndCheckResults() {
   host_pipe_->Start(this);
+}
 
+void MessagePipeConnectionTester::OnMessagePipeOpen() {
   for (int i = 0; i < message_count_; ++i) {
     std::unique_ptr<VideoPacket> message(new VideoPacket());
     message->mutable_data()->resize(message_size_);