Replace wstring with string16 in sandbox

sandbox/win/src/process_thread_policy.cc

Index: sandbox/win/src/process_thread_policy.cc
diff --git a/sandbox/win/src/process_thread_policy.cc b/sandbox/win/src/process_thread_policy.cc
index 9493b9ea1994f7c215617a28a5b4b9661c00c3a5..85a2f978a931d2657dcdbf71b664c28b2ffe6427 100644
--- a/sandbox/win/src/process_thread_policy.cc
+++ b/sandbox/win/src/process_thread_policy.cc
@@ -217,8 +217,8 @@ NTSTATUS ProcessPolicy::OpenProcessTokenExAction(const ClientInfo& client_info,
 
 DWORD ProcessPolicy::CreateProcessWAction(EvalResult eval_result,
                                           const ClientInfo& client_info,
-                                          const std::wstring &app_name,
-                                          const std::wstring &command_line,
+                                          const base::string16 &app_name,
+                                          const base::string16 &command_line,
                                           PROCESS_INFORMATION* process_info) {
   // The only action supported is ASK_BROKER which means create the process.
   if (GIVE_ALLACCESS != eval_result && GIVE_READONLY != eval_result) {