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This reverts commit 3192c3b0.

Reason for revert: compile failure on Mac GPU FYI

Original change's description:
> Add SharedImageRepresentationDawn
> 
> This will allow viewing shared images as Dawn textures, for example so
> they can be rendered to via WebGPU. This representation is implemented
> for IOSurface-backed shared images.
> 
> Also adds a test to render an IOSurface backed shared image using Dawn,
> and reading it back with Skia.
> 
> BUG=chromium:938895
> 
> Change-Id: If64ea4a67368687ff54326bdb20094f17902ad2c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1511419
> Commit-Queue: Corentin Wallez <cwallez@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#644717}

TBR=vmiura@chromium.org,cwallez@chromium.org,piman@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:938895
Change-Id: I951280b86bbd706f6fc75c46ab180013b9f6ff81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1543253Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645270}