Add QuicStringPiece which is actually StringPiece.

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 <cstdint>
 
 #include "base/macros.h"
 #include "net/quic/core/quic_packets.h"
 #include "net/quic/core/quic_stream_sequencer.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 
 namespace net {
 
 class QuicStream;
 class QuicSession;
 
 namespace test {
 
 class QuicStreamPeer {
  public:
   static void SetWriteSideClosed(bool value, QuicStream* stream);
   static void SetStreamBytesWritten(QuicStreamOffset stream_bytes_written,
                                     QuicStream* stream);
   static bool read_side_closed(QuicStream* stream);
   static void CloseReadSide(QuicStream* stream);
 
   static bool FinSent(QuicStream* stream);
   static bool RstSent(QuicStream* stream);
 
   static uint32_t SizeOfQueuedData(QuicStream* stream);
 
   static bool StreamContributesToConnectionFlowControl(QuicStream* stream);
 
   static void WriteOrBufferData(
       QuicStream* stream,
-      base::StringPiece data,
+      QuicStringPiece data,
       bool fin,
       QuicReferenceCountedPointer<QuicAckListenerInterface> ack_listener);
 
   static QuicStreamSequencer* sequencer(QuicStream* stream);
   static QuicSession* session(QuicStream* stream);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicStreamPeer);
 };
 
 }  // namespace test
 
 }  // namespace net
 
 #endif  // NET_QUIC_TEST_TOOLS_QUIC_STREAM_PEER_H_