Add QuicStringPiece which is actually StringPiece.

net/tools/quic/chlo_extractor.cc

 // Copyright (c) 2016 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/chlo_extractor.h"
 
 #include "net/quic/core/crypto/crypto_framer.h"
 #include "net/quic/core/crypto/crypto_handshake_message.h"
 #include "net/quic/core/crypto/crypto_protocol.h"
 #include "net/quic/core/crypto/quic_decrypter.h"
 #include "net/quic/core/crypto/quic_encrypter.h"
 #include "net/quic/core/quic_framer.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 #include "net/quic/platform/api/quic_text_utils.h"
 
-using base::StringPiece;
-
 namespace net {
 
 namespace {
 
 class ChloFramerVisitor : public QuicFramerVisitorInterface,
                           public CryptoFramerVisitorInterface {
  public:
   ChloFramerVisitor(QuicFramer* framer, ChloExtractor::Delegate* delegate);
 
   ~ChloFramerVisitor() override {}
@@ skipping 57 matching lines @@
   return true;
 }
 bool ChloFramerVisitor::OnUnauthenticatedHeader(
     const QuicPacketHeader& header) {
   return true;
 }
 bool ChloFramerVisitor::OnPacketHeader(const QuicPacketHeader& header) {
   return true;
 }
 bool ChloFramerVisitor::OnStreamFrame(const QuicStreamFrame& frame) {
-  StringPiece data(frame.data_buffer, frame.data_length);
+  QuicStringPiece data(frame.data_buffer, frame.data_length);
   if (frame.stream_id == kCryptoStreamId && frame.offset == 0 &&
       QuicTextUtils::StartsWith(data, "CHLO")) {
     CryptoFramer crypto_framer;
     crypto_framer.set_visitor(this);
     if (!crypto_framer.ProcessInput(data)) {
       return false;
     }
   }
   return true;
 }
@@ skipping 59 matching lines @@
   QuicFramer framer(versions, QuicTime::Zero(), Perspective::IS_SERVER);
   ChloFramerVisitor visitor(&framer, delegate);
   framer.set_visitor(&visitor);
   if (!framer.ProcessPacket(packet)) {
     return false;
   }
   return visitor.found_chlo();
 }
 
 }  // namespace net