Unsuppress WebGPU unittests on M1

Fixed: 1271926
Change-Id: Icdbb1b550971ad619d62d25720669a900907c13b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4061368


Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Auto-Submit: Austin Eng <enga@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1076569}