Revert "Clear out atlases if they haven't been used in a while."

This reverts commit 79007c9309cf26bb8dd3387fa242f04433ae9455.

Reason for revert: MSAN and fontregen issues

Original change's description:
> Clear out atlases if they haven't been used in a while.
> 
> This will stage out atlas pages one at a time with an interval of
> 256 flushes between them. Also removes the last page to help
> conserve memory if text or other atlas-using systems are not in use.
> 
> Bug: 1058905
> Change-Id: I8717621033068d0e24da944356d91b0f35e5373b
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/276764
> Commit-Queue: Jim Van Verth <jvanverth@google.com>
> Reviewed-by: Herb Derby <herb@google.com>

TBR=jvanverth@google.com,herb@google.com,robertphillips@google.com,backer@google.com

Change-Id: I5aa4326b490b66a4bb272069487311fc622a9711
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1058905
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/276959
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
2 files changed