Revert "[//cc] Add MappableSI path to OneCopyRasterBufferProvider"

This reverts commit 031f7c9ee19d8524abd7a1351b2e10de44ac78bf.

Reason for revert: Might cause a test consistency failure on https://ci.chromium.org/ui/p/chromium/builders/luci.chromium.ci/chromeos-amd64-generic-rel

Apologize for reverting. Please feel free to reland if it is not related, thanks.

Original change's description:
> [//cc] Add MappableSI path to OneCopyRasterBufferProvider
>
> This CL adds a new path to OneCopyRasterBufferProvider that uses
> MappableSharedImage rather than GpuMemoryBuffer. The new path is
> protected by a killswitch. The gist of the change is that rather than
> creating a GpuMemoryBuffer, mapping that in, and then later creating a
> SharedImage from it, the new path directly creates a
> MappableSharedImage (via the new CreateSI() entrypoint), maps that in,
> *and* additionally uses it in the same ways that the SI created from
> the GMB is being used.
>
> One subtlety is that the GMB is created with the size of the
> StagingBuffer, while the SharedImage for the StagingBuffer in its
> current creation point in CopyOnWorkerThread() is created with the
> `resource_size` param passed to PlaybackAndCopyOnWorkerThread(). Thus,
> we would want the MappableSI for the StagingBuffer to be created with
> "both" sizes. Fortunately (and as one would expect), the StagingBuffer
> is initialized with the `resource_size` param, so the two sizes are
> guaranteed to be the same [1].
>
> [1] https://source.chromium.org/chromium/chromium/src/+/main:cc/raster/one_copy_raster_buffer_provider.cc;l=295-297?q=CopyOnWorker&ss=chromium
>
> Bug: 1431314
> Change-Id: Id30b483c98247bd72a3f68d91d0a88474e006477
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4851302
> Commit-Queue: Colin Blundell <blundell@chromium.org>
> Reviewed-by: vikas soni <vikassoni@chromium.org>
> Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1200093}

Bug: 1431314, b/301608467
Change-Id: I0dcdcf341c7e537f839ac60d424808c66fbf82b2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4889244
Reviewed-by: Min Chen <minch@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Min Chen <minch@chromium.org>
Owners-Override: Min Chen <minch@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1200605}