Remove the `if (!mozilla::IsPointer<T>::value || thing)` check in
GCVariantImplementation::trace, as GCPolicy will dispatch these to
GCPointerPolicy and InternalPointerPolicy (for pointers) and StructGCPolicy (for
non-pointers).
Also use Rooted for prevState_ in AutoSetNewObjectMetadata and remove
inherit from CustomAutoRooter.
- modify line wrap up to 80 chars; (tw=80)
- modify size of tab to 2 chars everywhere; (sts=2, sw=2)
--HG--
extra : rebase_source : 7eedce0311b340c9a5a1265dc42d3121cc0f32a0
extra : amend_source : 9cb4ffdd5005f5c4c14172390dd00b04b2066cd7