Add QuicStringPiece which is actually StringPiece.

net/quic/quartc/quartc_stream.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/quic/quartc/quartc_stream.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 
 namespace net {
 
 QuartcStream::QuartcStream(QuicStreamId id, QuicSession* session)
     : QuicStream(id, session) {}
 QuartcStream::~QuartcStream() {}
 
 void QuartcStream::OnDataAvailable() {
   struct iovec iov;
   while (sequencer()->GetReadableRegions(&iov, 1) == 1) {
@@ skipping 30 matching lines @@
   return queued_data_bytes();
 }
 
 bool QuartcStream::fin_sent() {
   return QuicStream::fin_sent();
 }
 
 void QuartcStream::Write(const char* data,
                          size_t size,
                          const WriteParameters& param) {
-  WriteOrBufferData(base::StringPiece(data, size), param.fin, nullptr);
+  WriteOrBufferData(QuicStringPiece(data, size), param.fin, nullptr);
 }
 
 void QuartcStream::Close() {
   QuicStream::session()->CloseStream(id());
 }
 
 void QuartcStream::SetDelegate(QuartcStreamInterface::Delegate* delegate) {
   if (delegate_) {
     LOG(WARNING) << "The delegate for Stream " << id()
                  << " has already been set.";
   }
   delegate_ = delegate;
   DCHECK(delegate_);
 }
 
 }  // namespace net