Metal: Rewrite AutoObjCPtr as ObjCPtr Rewrite without WrappedObject base class, the base class only convolutes things and does not help. This way the class can be moved upwards in the software layers in subsequent commits. Fix the class so that it can be used with ObjCPtr<T> and ObjCPtr<id<P>> signatures, to resemble other smart pointers. Remove the Auto prefix, ObjCPtr should be relatable to other smart pointers such as unique_ptr. Bug: angleproject:393263506 Change-Id: Ia5a5728514b7f9182c2ec8380c04716e8b9d2351 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6219317 Auto-Submit: Kimmo Kinnunen <kkinnunen@apple.com> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Kimmo Kinnunen <kkinnunen@apple.com>