Improving flat containers interface.

base/bind_internal.h

Index: base/bind_internal.h
diff --git a/base/bind_internal.h b/base/bind_internal.h
index c27c34f38260d6ff8a003af7e74a36a1f5a2209b..e85bfd2549531236b3b923bf76c3567829136f36 100644
--- a/base/bind_internal.h
+++ b/base/bind_internal.h
@@ -46,19 +46,6 @@ namespace internal {
 //  BindState<> -- Stores the curried parameters, and is the main entry point
 //                 into the Bind() system.
 
-template <typename...>
-struct make_void {
-  using type = void;
-};
-
-// A clone of C++17 std::void_t.
-// Unlike the original version, we need |make_void| as a helper struct to avoid
-// a C++14 defect.
-// ref: http://en.cppreference.com/w/cpp/types/void_t
-// ref: http://open-std.org/JTC1/SC22/WG21/docs/cwg_defects.html#1558
-template <typename... Ts>
-using void_t = typename make_void<Ts...>::type;
-
 template <typename Callable,
           typename Signature = decltype(&Callable::operator())>
 struct ExtractCallableRunTypeImpl;