net: Update the include paths of base/string_piece.h to its new location.

net/quic/crypto/crypto_utils.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.
 //
 // Some helpers for quic crypto
 
 #ifndef NET_QUIC_CRYPTO_CRYPTO_UTILS_H_
 #define NET_QUIC_CRYPTO_CRYPTO_UTILS_H_
 
 #include <string>
 
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 #include "net/quic/crypto/crypto_handshake.h"
 #include "net/quic/crypto/crypto_protocol.h"
 
 namespace net {
 
 class QuicClock;
 class QuicRandom;
 struct QuicCryptoNegotiatedParameters;
 
@@ skipping 39 matching lines @@
   // |encrypter| or |decrypter|.
   static void DeriveKeys(QuicCryptoNegotiatedParameters* params,
                          base::StringPiece nonce,
                          const std::string& hkdf_input,
                          Perspective perspective);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CRYPTO_CRYPTO_UTILS_H_