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The PSA in https://hackmd.io/uH1MI9cnQBG9GGOZG20COw deprecates a number
of WebGPU APIs. Now that we are past the removal deadline we can remove
them from Blink and only keep the supported paths.

Bug: dawn:22
Change-Id: I9241e78db5578d6cb97593e9e3363b493fed481c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521120
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Auto-Submit: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827873}