Remove Gr1DKernelEffect "helper" class.

Change-Id: I748e49eeacb782fb738c08d5475c442dbce3ad5a
Reviewed-on: https://skia-review.googlesource.com/27500
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
6 files changed