Revert of adding gm to use random scaler context (patchset #4 id:60001 of https://codereview.chromium.org/1268853008/)

Reason for revert:
breaking bots

Original issue's description:
> adding gm to use random scaler context
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/853336c532504b3436d7dcbf252419f00c79066d

TBR=bsalomon@google.com,joshualitt@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1259033004
2 files changed