Remove two unused deprecated SkImage functions

This is part of a larger effort to clean up the SkImage API and require
users to provide the direct GPU context for manipulating GPU images.

Bug: skia:104662
Change-Id: Ic7fd675a6ec09f001266fd79efdf084368ab6cd5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/303630
Commit-Queue: Adlai Holler <adlai@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Auto-Submit: Adlai Holler <adlai@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
3 files changed