Finish removal of SkImageInfo from SkPixelRef

All of the clients are updated.  We don't need this anymore.

Bug: skia:6535
Change-Id: I1399a08b7dda8f29c4f4016a1de50ee8310c1fef
Reviewed-on: https://skia-review.googlesource.com/15106
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Matt Sarett <msarett@google.com>
3 files changed