SkGainmapInfo: Post-launch cleanup

Remove unused parameters from SkGainmapInfo. Leave the fType member
present because it is used in the Android repository.

Remove SkJpegGainmapEncoder::EncodeJpegR.

Bug: None
Change-Id: I5d08859dc1ce12cd11ac573be579427f6b357282
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/760336
Commit-Queue: ccameron chromium <ccameron@chromium.org>
Reviewed-by: Brian Osman <brianosman@google.com>
6 files changed