ObjectBase::refcount is no longer exposed and instead Reference() and
Release() methods are available to operate on it.
The client is now exposed through a GetClient() accessor.
Bug: dawn:1451
Change-Id: Ia47ed2de0a8f03ccc3275cb81d6335d2125060cb
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/93442
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Loko Kung <lokokung@google.com>