Revert of Give GrBatch a pointer to GrPipeline (patchset #1 id:1 of https://codereview.chromium.org/1237283007/)

Reason for revert:
breaking nanobench

Original issue's description:
> Give GrBatch a pointer to GrPipeline
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/1170a12839218f7a23c93487bf95fd83aae0201f

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

Review URL: https://codereview.chromium.org/1239073002
5 files changed