Delete SkPixelRefFactory

No one seems to be using this.

Bug: skia:
Change-Id: Iab0644dda2c62bd58159e0a1537138aa2e1ebcbc
Reviewed-on: https://skia-review.googlesource.com/11203
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Matt Sarett <msarett@google.com>
2 files changed