Clean up skottielib: modify access to package classes and delete unneeded code

Change-Id: I86bff8efde4bdcd269c0c9940643926f9362dff7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/299596
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Jorge Betancourt <jmbetancourt@google.com>
4 files changed