Remove unused (Android-only) stable ID from SkPixelRef

Bug: skia:
Change-Id: Ibfe5d7e4c713bf637318f3e2ecc219495bd62879
Reviewed-on: https://skia-review.googlesource.com/c/160767
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2 files changed