Add QuicStringPiece which is actually StringPiece.

net/tools/quic/quic_client.cc

 // 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.
 
 #include "net/tools/quic/quic_client.h"
 
 #include <errno.h>
 #include <netinet/in.h>
 #include <string.h>
 #include <sys/epoll.h>
@@ skipping 12 matching lines @@
 #include "net/tools/quic/platform/impl/quic_socket_utils.h"
 #include "net/tools/quic/quic_epoll_alarm_factory.h"
 #include "net/tools/quic/quic_epoll_connection_helper.h"
 
 #ifndef SO_RXQ_OVFL
 #define SO_RXQ_OVFL 40
 #endif
 
 // TODO(rtenneti): Add support for MMSG_MORE.
 #define MMSG_MORE 0
-using base::StringPiece;
 using std::string;
 
 namespace net {
 
 const int kEpollFlags = EPOLLIN | EPOLLOUT | EPOLLET;
 
 QuicClient::QuicClient(QuicSocketAddress server_address,
                        const QuicServerId& server_id,
                        const QuicVersionVector& supported_versions,
                        EpollServer* epoll_server,
@@ skipping 139 matching lines @@
   return fd_address_map_.back().first;
 }
 
 void QuicClient::ProcessPacket(const QuicSocketAddress& self_address,
                                const QuicSocketAddress& peer_address,
                                const QuicReceivedPacket& packet) {
   session()->ProcessUdpPacket(self_address, peer_address, packet);
 }
 
 }  // namespace net