Purge ccpr

Now that the clip atlas has been successfully migrated to
tessellation, we don't need this code anymore!

Change-Id: Ic97f50cff7c4ee59f4476f8410f0b30a32df4e90
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/419857
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
50 files changed