Revert of Patch to remove constant attributes (patchset #8 id:120002 of https://coder...

Revert of Patch to remove constant attributes (patchset #8 id:120002 of https://codereview.chromium.org/678073005/)

Reason for revert:
I'll checkin tonight when the tree is quieter

Original issue's description:
> Working patch to remove constant attributes.  This may cause some gm mismatches, I will rebaseline tonight.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/84c94c0dfd1e12e97d8a835882dda575f36e41d2
>
> Committed: https://skia.googlesource.com/skia/+/95f5194abce19e8ed875f3495fd16c79a9b931b4

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

Review URL: https://codereview.chromium.org/683203002