Refactor of Authenticator to allow it to ProcessMessage asynchronously and then call a callback

remoting/protocol/connection_to_client.cc

Index: remoting/protocol/connection_to_client.cc
diff --git a/remoting/protocol/connection_to_client.cc b/remoting/protocol/connection_to_client.cc
index d3814ba47a8d3f96e84b7f7b2de2dda62e6d5b34..c3a78169b2e88b22eb538d08f9cc14992bb46bfb 100644
--- a/remoting/protocol/connection_to_client.cc
+++ b/remoting/protocol/connection_to_client.cc
@@ -108,6 +108,7 @@ void ConnectionToClient::OnSessionStateChange(Session::State state) {
   switch(state) {
     case Session::INITIALIZING:
     case Session::CONNECTING:
+    case Session::ACCEPTING:
     case Session::CONNECTED:
       // Don't care about these events.
       break;