Add QuicStringPiece which is actually StringPiece.

net/quic/core/crypto/proof_verifier.h

 // 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.
 
 #ifndef NET_QUIC_CORE_CRYPTO_PROOF_VERIFIER_H_
 #define NET_QUIC_CORE_CRYPTO_PROOF_VERIFIER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "net/quic/core/quic_packets.h"
 #include "net/quic/core/quic_types.h"
 #include "net/quic/platform/api/quic_export.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 
 namespace net {
 
 // ProofVerifyDetails is an abstract class that acts as a container for any
 // implementation specific details that a ProofVerifier wishes to return. These
 // details are saved in the CachedState for the origin in question.
 class QUIC_EXPORT_PRIVATE ProofVerifyDetails {
  public:
   virtual ~ProofVerifyDetails() {}
 
@@ skipping 46 matching lines @@
   // This function may also return QUIC_PENDING, in which case the ProofVerifier
   // will call back, on the original thread, via |callback| when complete.
   //
   // The signature uses SHA-256 as the hash function and PSS padding in the
   // case of RSA.
   virtual QuicAsyncStatus VerifyProof(
       const std::string& hostname,
       const uint16_t port,
       const std::string& server_config,
       QuicVersion quic_version,
-      base::StringPiece chlo_hash,
+      QuicStringPiece chlo_hash,
       const std::vector<std::string>& certs,
       const std::string& cert_sct,
       const std::string& signature,
       const ProofVerifyContext* context,
       std::string* error_details,
       std::unique_ptr<ProofVerifyDetails>* details,
       std::unique_ptr<ProofVerifierCallback> callback) = 0;
 
   // VerifyCertChain checks that |certs| is a valid chain for |hostname|. On
   // success, it returns QUIC_SUCCESS. On failure, it returns QUIC_FAILURE and
@@ skipping 12 matching lines @@
       const std::vector<std::string>& certs,
       const ProofVerifyContext* context,
       std::string* error_details,
       std::unique_ptr<ProofVerifyDetails>* details,
       std::unique_ptr<ProofVerifierCallback> callback) = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_CRYPTO_PROOF_VERIFIER_H_