Replace wstring with string16 in sandbox

sandbox/win/src/registry_dispatcher.h

Index: sandbox/win/src/registry_dispatcher.h
diff --git a/sandbox/win/src/registry_dispatcher.h b/sandbox/win/src/registry_dispatcher.h
index 782a070e4e221d2256a7b2099e1b6af113d94e16..39f5f54246de9c99e85206c38fa4230bb8dc7f62 100644
--- a/sandbox/win/src/registry_dispatcher.h
+++ b/sandbox/win/src/registry_dispatcher.h
@@ -6,6 +6,7 @@
 #define SANDBOX_SRC_REGISTRY_DISPATCHER_H_
 
 #include "base/basictypes.h"
+#include "base/strings/string16.h"
 #include "sandbox/win/src/crosscall_server.h"
 #include "sandbox/win/src/sandbox_policy_base.h"
 
@@ -22,12 +23,12 @@ class RegistryDispatcher : public Dispatcher {
 
  private:
   // Processes IPC requests coming from calls to NtCreateKey in the target.
-  bool NtCreateKey(IPCInfo* ipc, std::wstring* name, DWORD attributes,
+  bool NtCreateKey(IPCInfo* ipc, base::string16* name, DWORD attributes,
                    HANDLE root, DWORD desired_access,
                    DWORD title_index, DWORD create_options);
 
   // Processes IPC requests coming from calls to NtOpenKey in the target.
-  bool NtOpenKey(IPCInfo* ipc, std::wstring* name, DWORD attributes,
+  bool NtOpenKey(IPCInfo* ipc, base::string16* name, DWORD attributes,
                  HANDLE root, DWORD desired_access);
 
   PolicyBase* policy_base_;