Replace wstring with string16 in sandbox

sandbox/win/src/sandbox_utils.h

 // Copyright (c) 2011 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 SANDBOX_SRC_SANDBOX_UTILS_H_
 #define SANDBOX_SRC_SANDBOX_UTILS_H_
 
 #include <windows.h>
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/strings/string16.h"
 #include "sandbox/win/src/nt_internals.h"
 
 namespace sandbox {
 
 // Returns true if the current OS is Windows XP SP2 or later.
 bool IsXPSP2OrLater();
 
-void InitObjectAttribs(const std::wstring& name,
+void InitObjectAttribs(const base::string16& name,
                        ULONG attributes,
                        HANDLE root,
                        OBJECT_ATTRIBUTES* obj_attr,
                        UNICODE_STRING* uni_name);
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_SRC_SANDBOX_UTILS_H_