Remove dependency on headers stream from QuicSession.

net/quic/test_tools/quic_spdy_session_peer.cc

+// Copyright (c) 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/quic/test_tools/quic_spdy_session_peer.h"
+
+#include "net/quic/quic_spdy_session.h"
+
+namespace net {
+namespace test {
+
+// static
+QuicHeadersStream* QuicSpdySessionPeer::GetHeadersStream(
+    QuicSpdySession* session) {
+  return session->headers_stream_.get();
+}
+
+// static
+void QuicSpdySessionPeer::SetHeadersStream(QuicSpdySession* session,
+                                           QuicHeadersStream* headers_stream) {
+  session->headers_stream_.reset(headers_stream);
+  session->static_streams()[headers_stream->id()] = headers_stream;
+}
+
+}  // namespace test
+}  // namespace net