Clean up unused SkPictureRecorder::optimizeFor()

Don't worry about the failing Shield bot... unrelated experiment.  It's failing at head.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2340133002

NOTREECHECKS=true

Review-Url: https://codereview.chromium.org/2340133002
2 files changed