Remove scaling support from SkBitmapCacheDesc, and unused factories

Bug: skia:
Change-Id: I9d6229a0cfe56671ea1494274c2717419078363d
Reviewed-on: https://skia-review.googlesource.com/c/159662
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
4 files changed