Remove SkSurface::MakeFromBackendTextureAsRenderTarget from public API

Still some more work to do to remove internal usage.


Bug: skia:9832
Change-Id: Id0403d92debc26af2002630a4dfcf960c9343260
Docs-Preview: https://skia.org/?cl=292719
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/292719
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
9 files changed