Revert "Reland "[graphite] Clean out unused Plot backing stores when purging DrawAtlas.""

This reverts commit 490944a9709e284df93a1178af639ba14e53f1e8.

Reason for revert: Might be causing glyph corruption in Chrome.

Original change's description:
> Reland "[graphite] Clean out unused Plot backing stores when purging DrawAtlas."
>
> This is a reland of commit a2329a9edfc465b7ed2f75b16b79b1eafe025959
>
> Original change's description:
> > [graphite] Clean out unused Plot backing stores when purging DrawAtlas.
> >
> > Bug: b/359350551
> > Change-Id: Ibf69bc9a2e9d820674231b27bdf34b35c4fe8d78
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/890737
> > Reviewed-by: Michael Ludwig <michaelludwig@google.com>
> > Commit-Queue: Jim Van Verth <jvanverth@google.com>
>
> Bug: b/359350551
> Change-Id: Id1bb69ae6e8fd6c3c94100e6f7f69f9666c9a257
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/892177
> Commit-Queue: Jim Van Verth <jvanverth@google.com>
> Reviewed-by: Michael Ludwig <michaelludwig@google.com>

Bug: b/359350551
Change-Id: I70a0d2496f170b3b2c6473550418f2796e1b4cfa
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/896016
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
2 files changed