Update WebGPUExpectations

Change-Id: I601aaf01f98c3213e02d721907f45f4efc87345c
Fixed: 1083478
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4060269


Auto-Submit: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1076570}