Add base:: to string16 in rlz/.

rlz/lib/machine_id.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 RLZ_LIB_MACHINE_ID_H_
 #define RLZ_LIB_MACHINE_ID_H_
 
 #include "base/strings/string16.h"
 
 #include <string>
 
 namespace rlz_lib {
 
 // Gets the unique ID for the machine used for RLZ tracking purposes. On
 // Windows, this ID is derived from the Windows machine SID, and is the string
 // representation of a 20 byte hash + 4 bytes volum id + a 1 byte checksum.
 // Included in financial pings with events, unless explicitly forbidden by the
 // calling application.
 bool GetMachineId(std::string* machine_id);
 
 // Retrieves a raw machine identifier string and a machine-specific
 // 4 byte value. GetMachineId() will SHA1 |data|, append |more_data|, compute
 // the Crc8 of that, and return a hex-encoded string of that data.
-bool GetRawMachineId(string16* data, int* more_data);
+bool GetRawMachineId(base::string16* data, int* more_data);
 
 namespace testing {
-bool GetMachineIdImpl(const string16& sid_string,
+bool GetMachineIdImpl(const base::string16& sid_string,
                       int volume_id,
                       std::string* machine_id);
 }  // namespace testing
 
 }  // namespace rlz_lib
 
 #endif  // RLZ_LIB_MACHINE_ID_H_