Support LCS signaling address in the Host.

remoting/protocol/me2me_host_authenticator_factory.cc

Index: remoting/protocol/me2me_host_authenticator_factory.cc
diff --git a/remoting/protocol/me2me_host_authenticator_factory.cc b/remoting/protocol/me2me_host_authenticator_factory.cc
index 18f99948c27b415fed837c755e57fa8ba0d15b79..92b3c2f812680101812dc3d05a9bac9037f61a8e 100644
--- a/remoting/protocol/me2me_host_authenticator_factory.cc
+++ b/remoting/protocol/me2me_host_authenticator_factory.cc
@@ -95,7 +95,7 @@ Me2MeHostAuthenticatorFactory::CreateAuthenticator(
       !base::StartsWith(remote_jid, remote_jid_prefix + '/',
                         base::CompareCase::INSENSITIVE_ASCII)) {
     LOG(ERROR) << "Rejecting incoming connection from " << remote_jid
-               << ": Prefix mismatch.";
+               << ": Prefix mismatch.  Expected: " << remote_jid_prefix;
     return base::WrapUnique(
         new RejectingAuthenticator(Authenticator::INVALID_CREDENTIALS));
   }