This brings the raster backend into line with Ganesh, which never had this hack.

Bug=skia:6836

Change-Id: I58581139bddb959e45f50b7549e857c8967ed691
Reviewed-on: https://chromium-review.googlesource.com/567267
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Reed <reed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486068}