Delete GrCCAtlasStack

Change-Id: I88d86f98044233364ae26c228e80ad51b6020e7f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/387376
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Adlai Holler <adlai@google.com>
7 files changed