Add QuicStringPiece which is actually StringPiece.

net/quic/test_tools/fake_proof_source.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/test_tools/fake_proof_source.h"
 
 #include "net/quic/platform/api/quic_logging.h"
 #include "net/quic/test_tools/crypto_test_utils.h"
 
 using std::string;
@@ skipping 30 matching lines @@
 
 void FakeProofSource::Activate() {
   active_ = true;
 }
 
 void FakeProofSource::GetProof(
     const QuicSocketAddress& server_address,
     const string& hostname,
     const string& server_config,
     QuicVersion quic_version,
-    StringPiece chlo_hash,
+    QuicStringPiece chlo_hash,
     const QuicTagVector& connection_options,
     std::unique_ptr<ProofSource::Callback> callback) {
   if (!active_) {
     delegate_->GetProof(server_address, hostname, server_config, quic_version,
                         chlo_hash, connection_options, std::move(callback));
     return;
   }
 
   params_.push_back(Params{server_address, hostname, server_config,
                            quic_version, chlo_hash.as_string(),
@@ skipping 14 matching lines @@
                       params.server_config, params.quic_version,
                       params.chlo_hash, params.connection_options,
                       std::move(params.callback));
 
   auto it = params_.begin() + n;
   params_.erase(it);
 }
 
 }  // namespace test
 }  // namespace net