Revert of Add direct getter for GrCaps to GrContext. (patchset #4 id:60001 of https://codereview.chromium.org/1149773005/)

Reason for revert:
Breaking

Original issue's description:
> Add direct getter for GrCaps to GrContext.
>
> TBR=joshualitt@google.com
>
> Committed: https://skia.googlesource.com/skia/+/9138c46e572085870638b6f7ad7fcdfcdf3cac99

TBR=joshualitt@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1164443002
22 files changed