WIP: base::Bind for rvalue references.

base/callback.h

Index: base/callback.h
diff --git a/base/callback.h b/base/callback.h
index 00669dd83d1c2dbb518134f0243fd5dbec104133..8a6e1d4008c3568e56929ee643302d34c7b405a8 100644
--- a/base/callback.h
+++ b/base/callback.h
@@ -388,16 +388,16 @@ class Callback<R(Args...)> : public internal::CallbackBase {
     return CallbackBase::Equals(other);
   }
 
-  R Run(typename internal::CallbackParamTraits<Args>::ForwardType... args)
-      const {
+  template <typename... RunArgs>
+  R Run(RunArgs&&... args) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
-    return f(bind_state_.get(), internal::CallbackForward(args)...);
+    return f(bind_state_.get(), std::forward<RunArgs>(args)...);
   }
 
  private:
-  typedef R(*PolymorphicInvoke)(
+  typedef R (*PolymorphicInvoke)(
       internal::BindStateBase*,
       typename internal::CallbackParamTraits<Args>::ForwardType...);
 };