Add QuicStringPiece which is actually StringPiece.

net/quic/chromium/crypto/proof_test_chromium.cc

 // Copyright (c) 2013 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 <memory>
 
 #include "base/files/file_path.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
@@ skipping 38 matching lines @@
   string* const error_details_;
 };
 
 // RunVerification runs |verifier->VerifyProof| and asserts that the result
 // matches |expected_ok|.
 void RunVerification(ProofVerifier* verifier,
                      const string& hostname,
                      const uint16_t port,
                      const string& server_config,
                      QuicVersion quic_version,
-                     StringPiece chlo_hash,
+                     QuicStringPiece chlo_hash,
                      const std::vector<string>& certs,
                      const string& proof,
                      bool expected_ok) {
   std::unique_ptr<ProofVerifyDetails> details;
   TestCompletionCallback comp_callback;
   bool ok;
   string error_details;
   std::unique_ptr<ProofVerifyContext> verify_context(
       crypto_test_utils::ProofVerifyContextForTesting());
   std::unique_ptr<TestProofVerifierCallback> callback(
@@ skipping 148 matching lines @@
   EXPECT_TRUE(chain->HasOneRef());
 
   EXPECT_FALSE(chain->certs.empty());
   for (const string& cert : chain->certs) {
     EXPECT_FALSE(cert.empty());
   }
 }
 
 }  // namespace test
 }  // namespace net