Replace QuicAckListenerInterface* with scoped_refptr<QuicAckListenerInterface>.

net/quic/test_tools/quic_stream_peer.h

 // Copyright (c) 2012 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_STREAM_PEER_H_
 #define NET_QUIC_TEST_TOOLS_QUIC_STREAM_PEER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 24 matching lines @@
   static bool WriteSideClosed(QuicStream* stream);
 
   static uint32_t SizeOfQueuedData(QuicStream* stream);
 
   static bool StreamContributesToConnectionFlowControl(QuicStream* stream);
 
   static void WriteOrBufferData(
       QuicStream* stream,
       base::StringPiece data,
       bool fin,
-      QuicAckListenerInterface* ack_notifier_delegate);
+      const scoped_refptr<QuicAckListenerInterface>& ack_notifier_delegate);
 
   static net::QuicStreamSequencer* sequencer(QuicStream* stream);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicStreamPeer);
 };
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_QUIC_TEST_TOOLS_QUIC_STREAM_PEER_H_