Revert of leave pixel memory uninitialized for opaque alpha type in SkSurface::MakeRaster (patchset #1 id:1 of https://codereview.chromium.org/2412633002/ )

Reason for revert:
Reverting while we think about skia:5854 so the bot doesn't regress further.

Original issue's description:
> leave pixel memory uninitialized for opaque alpha type in SkSurface::MakeRaster
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2412633002
>
> Committed: https://skia.googlesource.com/skia/+/c64ef3563dc8badac3d64544513b03df826cf8c3

TBR=mtklein@chromium.org,bsalomon@google.com,reed@google.com,lsalzman@mozilla.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:5854

Review-Url: https://codereview.chromium.org/2421473003
2 files changed