Add QuicStringPiece which is actually StringPiece.

net/quic/core/crypto/quic_encrypter.h

 // Copyright (c) 2012 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_QUIC_ENCRYPTER_H_
 #define NET_QUIC_CORE_CRYPTO_QUIC_ENCRYPTER_H_
 
 #include <cstddef>
 
 #include "net/quic/core/quic_packets.h"
 #include "net/quic/platform/api/quic_export.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 
 namespace net {
 
 class QUIC_EXPORT_PRIVATE QuicEncrypter {
  public:
   virtual ~QuicEncrypter() {}
 
   static QuicEncrypter* Create(QuicTag algorithm);
 
   // Sets the encryption key. Returns true on success, false on failure.
   //
   // NOTE: The key is the client_write_key or server_write_key derived from
   // the master secret.
-  virtual bool SetKey(base::StringPiece key) = 0;
+  virtual bool SetKey(QuicStringPiece key) = 0;
 
   // Sets the fixed initial bytes of the nonce. Returns true on success,
   // false on failure.
   //
   // NOTE: The nonce prefix is the client_write_iv or server_write_iv
   // derived from the master secret. A 64-bit packet number will
   // be appended to form the nonce.
   //
   //                          <------------ 64 bits ----------->
   //   +---------------------+----------------------------------+
   //   |    Fixed prefix     |      packet number      |
   //   +---------------------+----------------------------------+
   //                          Nonce format
   //
   // The security of the nonce format requires that QUIC never reuse a
   // packet number, even when retransmitting a lost packet.
-  virtual bool SetNoncePrefix(base::StringPiece nonce_prefix) = 0;
+  virtual bool SetNoncePrefix(QuicStringPiece nonce_prefix) = 0;
 
   // Writes encrypted |plaintext| and a MAC over |plaintext| and
   // |associated_data| into output. Sets |output_length| to the number of
   // bytes written. Returns true on success or false if there was an error.
   // |packet_number| is appended to the |nonce_prefix| value provided in
   // SetNoncePrefix() to form the nonce. |output| must not overlap with
   // |associated_data|. If |output| overlaps with |plaintext| then
   // |plaintext| must be <= |output|.
   virtual bool EncryptPacket(QuicVersion version,
                              QuicPacketNumber packet_number,
-                             base::StringPiece associated_data,
-                             base::StringPiece plaintext,
+                             QuicStringPiece associated_data,
+                             QuicStringPiece plaintext,
                              char* output,
                              size_t* output_length,
                              size_t max_output_length) = 0;
 
   // GetKeySize() and GetNoncePrefixSize() tell the HKDF class how many bytes
   // of key material needs to be derived from the master secret.
   // NOTE: the sizes returned by GetKeySize() and GetNoncePrefixSize() are
   // also correct for the QuicDecrypter of the same algorithm. So only
   // QuicEncrypter has these two methods.
 
   // Returns the size in bytes of a key for the algorithm.
   virtual size_t GetKeySize() const = 0;
   // Returns the size in bytes of the fixed initial part of the nonce.
   virtual size_t GetNoncePrefixSize() const = 0;
 
   // Returns the maximum length of plaintext that can be encrypted
   // to ciphertext no larger than |ciphertext_size|.
   virtual size_t GetMaxPlaintextSize(size_t ciphertext_size) const = 0;
 
   // Returns the length of the ciphertext that would be generated by encrypting
   // to plaintext of size |plaintext_size|.
   virtual size_t GetCiphertextSize(size_t plaintext_size) const = 0;
 
   // For use by unit tests only.
-  virtual base::StringPiece GetKey() const = 0;
-  virtual base::StringPiece GetNoncePrefix() const = 0;
+  virtual QuicStringPiece GetKey() const = 0;
+  virtual QuicStringPiece GetNoncePrefix() const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_CRYPTO_QUIC_ENCRYPTER_H_