Add QuicStringPiece which is actually StringPiece.

net/tools/quic/quic_simple_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_simple_client.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/run_loop.h"
@@ skipping 11 matching lines @@
 #include "net/quic/core/quic_connection.h"
 #include "net/quic/core/quic_flags.h"
 #include "net/quic/core/quic_packets.h"
 #include "net/quic/core/quic_server_id.h"
 #include "net/quic/core/spdy_utils.h"
 #include "net/socket/udp_client_socket.h"
 #include "net/spdy/spdy_header_block.h"
 #include "net/spdy/spdy_http_utils.h"
 
 using std::string;
-using base::StringPiece;
 
 namespace net {
 
 QuicSimpleClient::QuicSimpleClient(
     QuicSocketAddress server_address,
     const QuicServerId& server_id,
     const QuicVersionVector& supported_versions,
     std::unique_ptr<ProofVerifier> proof_verifier)
     : QuicClientBase(server_id,
                      supported_versions,
@@ skipping 118 matching lines @@
       QuicSocketAddress(QuicSocketAddressImpl(local_address)),
       QuicSocketAddress(QuicSocketAddressImpl(peer_address)), packet);
   if (!session()->connection()->connected()) {
     return false;
   }
 
   return true;
 }
 
 }  // namespace net