Revert "[//gpu][mac] Support multiple concurrent read access in Graphite"

This reverts commit d53449b702e7d67460467d25fdb14904bf79bca1.

Reason for revert: It looks like this CL is likely still the source
of crashiness, albeit now the crash is different:

https://crash.corp.google.com/browse?q=product_name%3D%27Chrome_Mac%27+AND+expanded_custom_data.ChromeCrashProto.magic_signature_1.name%3D%27%5BDump+without+crash%5D+dawn%3A%3Anative%3A%3ADeviceBase%3A%3AHandleError%27+AND+expanded_custom_data.ChromeCrashProto.channel%3D%27canary%27+AND+product.Version%3D%27123.0.6304.0%27&stbtiq=&reportid=&index=0#2

Original change's description:
> [//gpu][mac] Support multiple concurrent read access in Graphite
>
> We have discovered that the lack of this support is a source of
> significant overhead for Graphite vs. Ganesh on at least one perf
> benchmark, as this is supported in Ganesh [1].
>
> This function was added here [2]. It's not obvious to me what the
> requirements are for it being able to be supported in a given
> representation. This CL enables it for
> SkiaGraphiteDawnImageRepresentation for Mac. Local testing shows that
> it works unproblematically, including on YouTube and WebGPU's demo
> pages.
>
> NOTE: This CL is a reland of [3] (with the plumbing changes split out
> to a predecessor CL). The test crashes that caused a revert are fixed
> in [4].
>
> [1] https://source.chromium.org/chromium/chromium/src/+/main:gpu/command_buffer/service/shared_image/iosurface_image_backing.mm;l=373-375;drc=b58207f5aecc39db7d3da766e7d171e5d2c3598e;bpv=1;bpt=1
> [2] https://chromium-review.googlesource.com/c/chromium/src/+/1963098
> [3] https://chromium-review.googlesource.com/c/chromium/src/+/5250233
> [4] https://chromium-review.googlesource.com/c/chromium/src/+/5296634
>
> Bug: 41496467
> Change-Id: I5b26080c5605b9dcf8e25c649370fa8a01a391ed
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5300195
> Commit-Queue: Colin Blundell <blundell@chromium.org>
> Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1261076}

Bug: 41496467
Change-Id: Ib86e70a0ef0132dd4192f4dfffa0ca124a4a3a7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5300566
Auto-Submit: Colin Blundell <blundell@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1261627}