Avoid to use the method pointer to Callback<>::Run on gmock tests

testing/gmock_mutant.h

Index: testing/gmock_mutant.h
diff --git a/testing/gmock_mutant.h b/testing/gmock_mutant.h
index 961673fa110eb792d1ff3540f6c46721301b4398..2a41cf54da750fd265b35b49b362734a0901e19c 100644
--- a/testing/gmock_mutant.h
+++ b/testing/gmock_mutant.h
@@ -113,6 +113,12 @@ CallbackToFunctor(const base::Callback<Signature>& cb) {
   return CallbackToFunctorHelper<Signature>(cb);
 }
 
+template <typename Functor>
+CallbackToFunctorHelper<typename Functor::RunType> CreateFunctor(
+    Functor functor) {
+  return CallbackToFunctor(functor);
+}
+
 template <typename Functor, typename... BoundArgs>
 CallbackToFunctorHelper<base::MakeUnboundRunType<Functor, BoundArgs...>>
 CreateFunctor(Functor functor, const BoundArgs&... args) {