tree 88c20001ceebaba19b7da1d9ba458bc936431dfc
parent ba5848953e00685f9a57343aef94372c5803130a
author scroggo <scroggo@chromium.org> 1463779636 -0700
committer Commit bot <commit-bot@chromium.org> 1463779636 -0700

Remove unnecessary check

Follow-on from crrev.com/1996993003

No need to check the alpha type. If the color type is gray, the
source alpha type will be opaque.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2002723002

Review-Url: https://codereview.chromium.org/2002723002