remove internal uses of SkColorSpace::toXYZD50()

There's one more to replace in Chromium,
then the method and cached SkMatrix44 can go.

Change-Id: I20cfac8b7bd26216f66f6d70fa9d117d0b17cee5
Reviewed-on: https://skia-review.googlesource.com/c/159302
Auto-Submit: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
6 files changed