Replace wstring with string16 in sandbox

sandbox/win/src/registry_policy.h

Index: sandbox/win/src/registry_policy.h
diff --git a/sandbox/win/src/registry_policy.h b/sandbox/win/src/registry_policy.h
index 8badde227d572f29cbabc30d43055b149f35053b..69af8415d2492952a53bda4d253f859ba1539432 100644
--- a/sandbox/win/src/registry_policy.h
+++ b/sandbox/win/src/registry_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"
@@ -30,7 +31,7 @@ class RegistryPolicy {
   // API that is compatible with the IPC-received parameters.
   static bool CreateKeyAction(EvalResult eval_result,
                               const ClientInfo& client_info,
-                              const std::wstring &key,
+                              const base::string16 &key,
                               uint32 attributes,
                               HANDLE root_directory,
                               uint32 desired_access,
@@ -44,7 +45,7 @@ class RegistryPolicy {
   // API that is compatible with the IPC-received parameters.
   static bool OpenKeyAction(EvalResult eval_result,
                               const ClientInfo& client_info,
-                              const std::wstring &key,
+                              const base::string16 &key,
                               uint32 attributes,
                               HANDLE root_directory,
                               uint32 desired_access,