Should be no longer necessary with shared garbage collection in
RendererVk.

Bug: angleproject:2464
Change-Id: I8ebd910cf36dd0b18d83d32981db28599d443ec3
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1825445
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>