Don't close already closed connections in

QuicClientSession::CloseSessionOnErrorInner.

Review URL: https://codereview.chromium.org/284303007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271548 0039d316-1c4b-4281-b951-d872f2087c98

net/quic/quic_client_session.cc

@@ -646,6 +646,7 @@ void QuicClientSession::CloseSessionOnErrorInner(int net_error,
       NetLog::TYPE_QUIC_SESSION_CLOSE_ON_ERROR,
       NetLog::IntegerCallback("net_error", net_error));
 
+  if (connection()->connected())
     connection()->CloseConnection(quic_error, false);
   DCHECK(!connection()->connected());
 }