Bug 1479673 - Trivial return value change, r=jonco

JS::ubi::Concrete<T> inherits from JS::ubi::Base but not JS::ubi::Node, so the bare 'Size' in the class declaration refers to Base::Size, not Node::Size. (Note that they're the same underlying type.)

--HG--
extra : topic : gcstats.thresh
extra : rebase_source : 2dd9ccca9e458e4f10bdbb8aff58f08732e712c7

js/src/vm/JSScript.cpp

@@ -4491,7 +4491,7 @@ JSScript::AutoDelazify::dropScript()
     script_ = nullptr;
 }
 
-JS::ubi::Node::Size
+JS::ubi::Base::Size
 JS::ubi::Concrete<JSScript>::size(mozilla::MallocSizeOf mallocSizeOf) const
 {
     Size size = Arena::thingSize(get().asTenured().getAllocKind());