QUIC - refactor in preparation for two streams per HTTP transaction.

net/tools/quic/quic_simple_server_session.cc

Index: net/tools/quic/quic_simple_server_session.cc
diff --git a/net/tools/quic/quic_simple_server_session.cc b/net/tools/quic/quic_simple_server_session.cc
index fd9a98d8e4ca54bb42da9e6aaa13c523af0e5e35..a1077462a7cb4b37d46cc918319760d348e4cd4b 100644
--- a/net/tools/quic/quic_simple_server_session.cc
+++ b/net/tools/quic/quic_simple_server_session.cc
@@ -178,9 +178,8 @@ void QuicSimpleServerSession::SendPushPromise(QuicStreamId original_stream_id,
                                               QuicStreamId promised_stream_id,
                                               SpdyHeaderBlock headers) {
   DVLOG(1) << "stream " << original_stream_id
-           << " send PUSH_PROMISE for promised stream " << promised_stream_id;
-  headers_stream()->WritePushPromise(original_stream_id, promised_stream_id,
-                                     std::move(headers));
+             << " send PUSH_PROMISE for promised stream " << promised_stream_id;
+  WritePushPromise(original_stream_id, promised_stream_id, std::move(headers));
 }
 
 void QuicSimpleServerSession::HandlePromisedPushRequests() {