Remove dependency on headers stream from QuicSession.

net/quic/test_tools/quic_spdy_session_peer.h

+// 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.
+
+#ifndef NET_QUIC_TEST_TOOLS_QUIC_SPDY_SESSION_PEER_H_
+#define NET_QUIC_TEST_TOOLS_QUIC_SPDY_SESSION_PEER_H_
+
+#include "net/quic/quic_protocol.h"
+#include "net/quic/quic_write_blocked_list.h"
+
+namespace net {
+
+class QuicHeadersStream;
+class QuicSpdySession;
+
+namespace test {
+
+class QuicSpdySessionPeer {
+ public:
+  static QuicHeadersStream* GetHeadersStream(QuicSpdySession* session);
+  static void SetHeadersStream(QuicSpdySession* session,
+                               QuicHeadersStream* headers_stream);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(QuicSpdySessionPeer);
+};
+
+}  // namespace test
+
+}  // namespace net
+
+#endif  // NET_QUIC_TEST_TOOLS_QUIC_SPDY_SESSION_PEER_H_