Remove GrRestrictedAtlasManager

Philosophically this relies on: https://skia-review.googlesource.com/c/skia/+/111807 (Revise Text & Small Path Atlas so instantiation failure is handled at flush time)

Change-Id: I4fdcf1af8c5e9ffefdfb973104045f4f5d223a4e
Reviewed-on: https://skia-review.googlesource.com/112702
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
18 files changed