Revert of Add effect caching to distance field text. (https://codereview.chromium.org/424103002/)

Reason for revert:
breaking Chrome canary.

Original issue's description:
> Add effect caching to distance field text.
>
> This also is a step towards unifying GrDistanceFieldTextureEffect and GrDistanceFieldLCDTextureEffect.
>
> Committed: https://skia.googlesource.com/skia/+/137bac067306c5446bc4f9797bedc3bbaf302822

R=robertphillips@google.com, jvanverth@google.com
TBR=jvanverth@google.com, robertphillips@google.com
NOTREECHECKS=true
NOTRY=true

Author: bensong@google.com

Review URL: https://codereview.chromium.org/424173002
4 files changed