Replace wstring with string16 in sandbox

sandbox/win/src/sync_policy.h

Index: sandbox/win/src/sync_policy.h
diff --git a/sandbox/win/src/sync_policy.h b/sandbox/win/src/sync_policy.h
index 93aef64af607d0014793b355eef49460751444d3..4383998205f9fc79d266ddb981b3620c71cd2d8e 100644
--- a/sandbox/win/src/sync_policy.h
+++ b/sandbox/win/src/sync_policy.h
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/strings/string16.h"
 #include "sandbox/win/src/crosscall_server.h"
 #include "sandbox/win/src/nt_internals.h"
 #include "sandbox/win/src/policy_low_level.h"
@@ -34,13 +35,13 @@ class SyncPolicy {
   // eval_result is the desired policy action to accomplish.
   static DWORD CreateEventAction(EvalResult eval_result,
                                  const ClientInfo& client_info,
-                                 const std::wstring &event_name,
+                                 const base::string16 &event_name,
                                  uint32 event_type,
                                  uint32 initial_state,
                                  HANDLE *handle);
   static DWORD OpenEventAction(EvalResult eval_result,
                                const ClientInfo& client_info,
-                               const std::wstring &event_name,
+                               const base::string16 &event_name,
                                uint32 desired_access,
                                HANDLE *handle);
 };