Revert of Added varying struct (patchset #9 id:160001 of https://codereview.chromium.org/671023002/)

Reason for revert:
may have caused gm change on arm

Original issue's description:
> Added varying struct
>
> TBR=
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/852ae80b9c3c6fd53f993ac35133d80863993cbe

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

Review URL: https://codereview.chromium.org/675193002
17 files changed