Add QuicStringPiece which is actually StringPiece.

net/quic/core/quic_packet_creator.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.
 //
 // Accumulates frames for the next packet until more frames no longer fit or
 // it's time to create a packet from them. If multipath enabled, only creates
 // packets on one path at the same time. Currently, next packet number is
 // tracked per-path.
 
 #ifndef NET_QUIC_CORE_QUIC_PACKET_CREATOR_H_
 #define NET_QUIC_CORE_QUIC_PACKET_CREATOR_H_
 
 #include <cstddef>
 #include <memory>
 #include <string>
 #include <unordered_map>
 #include <utility>
 #include <vector>
 
 #include "base/macros.h"
-#include "base/strings/string_piece.h"
 #include "net/quic/core/quic_connection_close_delegate_interface.h"
 #include "net/quic/core/quic_framer.h"
 #include "net/quic/core/quic_iovector.h"
 #include "net/quic/core/quic_packets.h"
 #include "net/quic/core/quic_pending_retransmission.h"
 #include "net/quic/platform/api/quic_export.h"
 
 namespace net {
 namespace test {
 class QuicPacketCreatorPeer;
@@ skipping 273 matching lines @@
 
   // The latched value of FLAGS_quic_reloadable_flag_quic_no_stop_waiting_frames
   bool latched_flag_no_stop_waiting_frames_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicPacketCreator);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_QUIC_PACKET_CREATOR_H_