Cruft leftover from GrSurfaceContext hierarchy v1/v2 split

Non-substantive changes that didn't fit any earlier CL in the chain.

Bug: skia:11837
Change-Id: Ic9b7c05c014b03ab5b30532098fb8cd2da846d9a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/428958
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
18 files changed