Revert of make blitAntiH2 virtual, to prep for larger change (patchset #1 id:1 of https://codereview.chromium.org/1048323005/)

Reason for revert:
end of test

Original issue's description:
> make blitAntiH2 virtual, to prep for larger change
>
> testing...
>
> BUG=skia:
> TBR=
>
> Committed: https://skia.googlesource.com/skia/+/33afdaa5213cf118b3ca290bb343253c8593756d

TBR=
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1086293002
1 file changed