Abolish absClear

Change-Id: Iec1eba6a3e54b06685ca637e9950b3e8f95a4ae6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/243176
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
4 files changed