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

remoting/protocol/auth_util.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 REMOTING_PROTOCOL_AUTH_UTIL_H_
 #define REMOTING_PROTOCOL_AUTH_UTIL_H_
 
 #include <string>
 
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 
 namespace net {
 class SSLSocket;
 }  // namespace net
 
 namespace remoting {
 namespace protocol {
 
 // Labels for use when exporting the SSL master keys.
 extern const char kClientAuthSslExporterLabel[];
@@ skipping 24 matching lines @@
 // Returns authentication bytes that must be used for the given
 // |socket|. Empty string is returned in case of failure.
 std::string GetAuthBytes(net::SSLSocket* socket,
                          const base::StringPiece& label,
                          const base::StringPiece& shared_secret);
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_AUTH_UTIL_H_