Add QuicStringPiece which is actually StringPiece.

net/quic/core/quic_crypto_stream.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_QUIC_CRYPTO_STREAM_H_
 #define NET_QUIC_CORE_QUIC_CRYPTO_STREAM_H_
 
 #include <cstddef>
 
 #include "base/macros.h"
 #include "net/quic/core/crypto/crypto_framer.h"
 #include "net/quic/core/crypto/crypto_utils.h"
 #include "net/quic/core/quic_config.h"
 #include "net/quic/core/quic_packets.h"
 #include "net/quic/core/quic_stream.h"
 #include "net/quic/platform/api/quic_export.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 
 namespace net {
 
 class CryptoHandshakeMessage;
 class QuicSession;
 
 // Crypto handshake messages in QUIC take place over a reserved stream with the
 // id 1.  Each endpoint (client and server) will allocate an instance of a
 // subclass of QuicCryptoStream to send and receive handshake messages.  (In the
 // normal 1-RTT handshake, the client will send a client hello, CHLO, message.
@@ skipping 23 matching lines @@
   void OnDataAvailable() override;
 
   // Sends |message| to the peer.
   // TODO(wtc): return a success/failure status.
   void SendHandshakeMessage(const CryptoHandshakeMessage& message);
 
   // Performs key extraction to derive a new secret of |result_len| bytes
   // dependent on |label|, |context|, and the stream's negotiated subkey secret.
   // Returns false if the handshake has not been confirmed or the parameters are
   // invalid (e.g. |label| contains null bytes); returns true on success.
-  bool ExportKeyingMaterial(base::StringPiece label,
-                            base::StringPiece context,
+  bool ExportKeyingMaterial(QuicStringPiece label,
+                            QuicStringPiece context,
                             size_t result_len,
                             std::string* result) const;
 
   // Performs key extraction for Token Binding. Unlike ExportKeyingMaterial,
   // this function can be called before forward-secure encryption is
   // established. Returns false if initial encryption has not been established,
   // and true on success.
   //
   // Since this depends only on the initial keys, a signature over it can be
   // repurposed by an attacker who obtains the client's or server's DH private
@@ skipping 14 matching lines @@
 
  private:
   CryptoFramer crypto_framer_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicCryptoStream);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_QUIC_CRYPTO_STREAM_H_