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And deprecate GPUBindGroupLayoutEntry.multisampled.

Bug: dawn:517
Change-Id: I0959d46f603c2c7741dc2288098ca119d38b344e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440655Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812603}