Replace wstring with string16 in sandbox

sandbox/win/src/window.h

 // Copyright (c) 2009 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_WINDOW_H_
 #define SANDBOX_SRC_WINDOW_H_
 
 #include <windows.h>
 #include <string>
 
+#include "base/strings/string16.h"
 #include "sandbox/win/src/sandbox_types.h"
 
 namespace sandbox {
 
   // Creates a window station. The name is generated by the OS. The security
   // descriptor is based on the security descriptor of the current window
   // station.
   ResultCode CreateAltWindowStation(HWINSTA* winsta);
 
   // Creates a desktop. The name is a static string followed by the pid of the
   // current process. The security descriptor on the new desktop is based on the
   // security descriptor of the desktop associated with the current thread.
   // If a winsta is specified, the function will switch to it before creating
   // the desktop. If the functions fails the switch back to the current winsta,
   // the function will return SBOX_ERROR_FAILED_TO_SWITCH_BACK_WINSTATION.
   ResultCode CreateAltDesktop(HWINSTA winsta, HDESK* desktop);
 
   // Returns the name of a desktop or a window station.
-  std::wstring GetWindowObjectName(HANDLE handle);
+  base::string16 GetWindowObjectName(HANDLE handle);
 
   // Returns the name of the desktop referenced by |desktop|. If a window
   // station is specified, the name is prepended with the window station name,
   // followed by a backslash. This name can be used as the lpDesktop parameter
   // to CreateProcess.
-  std::wstring GetFullDesktopName(HWINSTA winsta, HDESK desktop);
+  base::string16 GetFullDesktopName(HWINSTA winsta, HDESK desktop);
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_SRC_WINDOW_H_