Replace wstring with string16 in sandbox

sandbox/win/tests/validation_tests/commands.h

Index: sandbox/win/tests/validation_tests/commands.h
diff --git a/sandbox/win/tests/validation_tests/commands.h b/sandbox/win/tests/validation_tests/commands.h
index 9b797a511d904281a7ec8561f7aa95d34d2e9c25..3a6a0f5f0dc2b99889722fcf92bbf8321047e018 100644
--- a/sandbox/win/tests/validation_tests/commands.h
+++ b/sandbox/win/tests/validation_tests/commands.h
@@ -5,6 +5,10 @@
 #ifndef SANDBOX_TESTS_VALIDATION_TESTS_COMMANDS_H__
 #define SANDBOX_TESTS_VALIDATION_TESTS_COMMANDS_H__
 
+#include <windows.h>
+
+#include "base/strings/string16.h"
+
 namespace sandbox {
 
 // Checks if window is a real window. Returns a SboxTestResult.
@@ -17,13 +21,13 @@ int TestOpenProcess(DWORD process_id, DWORD access_mask);
 int TestOpenThread(DWORD thread_id);
 
 // Tries to open path for read access. Returns a SboxTestResult.
-int TestOpenReadFile(const std::wstring& path);
+int TestOpenReadFile(const base::string16& path);
 
 // Tries to open path for write access. Returns a SboxTestResult.
-int TestOpenWriteFile(const std::wstring& path);
+int TestOpenWriteFile(const base::string16& path);
 
 // Tries to open a registry key.
-int TestOpenKey(HKEY base_key, std::wstring subkey);
+int TestOpenKey(HKEY base_key, base::string16 subkey);
 
 // Tries to open the workstation's input desktop as long as the
 // current desktop is not the interactive one. Returns a SboxTestResult.