Remove GrColor4f

All uses have been converted to SkPMColor4f (or similar).

Bug: skia:
Change-Id: I220bd5eaf6c35b17321c1e8bc92ace7ff92908c4
Reviewed-on: https://skia-review.googlesource.com/c/162749
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
11 files changed