Update SkImage_NewFromTexture test, to just test release
procs of SkImage::MakeFromTexture.

Previous code included an old pattern, and may be
responsible for intermittent Mac bot failure

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2168933002

Review-Url: https://codereview.chromium.org/2168933002
1 file changed