Move ownership of Transport out of Session.

remoting/protocol/fake_authenticator.cc

Index: remoting/protocol/fake_authenticator.cc
diff --git a/remoting/protocol/fake_authenticator.cc b/remoting/protocol/fake_authenticator.cc
index 5cb2f21dd59bad821b33da6b80e56f0eb67e0c6d..705bdf19de4e3fbfd374d299bfec772f23cef058 100644
--- a/remoting/protocol/fake_authenticator.cc
+++ b/remoting/protocol/fake_authenticator.cc
@@ -35,9 +35,9 @@ void FakeChannelAuthenticator::SecureAndAuthenticate(
     const DoneCallback& done_callback) {
   socket_ = std::move(socket);
 
-  if (async_) {
-    done_callback_ = done_callback;
+  done_callback_ = done_callback;
 
+  if (async_) {
     if (result_ != net::OK) {
       // Don't write anything if we are going to reject auth to make test
       // ordering deterministic.