Revert of modify nothingToDraw to notice filters (patchset #1 id:1 of https://codereview.chromium.org/717753002/)

Reason for revert:
modecolorfilters, perhaps more changed

Original issue's description:
> modify nothingToDraw to notice filters
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/d5688c509293a450c058e0cc1f4673be2931bb5c

TBR=djsollen@google.com,reed@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/717813002
Fix "Add support for rebaselining from trybots."

Commit d09ade4b44edc11 was missing a needed edit.
modify nothingToDraw to notice filters

This reverts commit c71ffd4e76d1abcd28ac74463349970f60a3350f.

TBR=

Review URL: https://codereview.chromium.org/683003003
notice null colorfilter in legacy unflattening

BUG=skia:3117

Review URL: https://codereview.chromium.org/691383003
Remove coverage from grpaint

BUG=skia:

Review URL: https://codereview.chromium.org/683133006