prepare to remove obsolete macros

SkColorSetARGBMacro and SkColorSetARGBInline
are macros which will be deleted. Replace them
with a standard equivalent.

R=scroggo@google.com
Bug: skia:6898
Change-Id: I16e010776e991c19a375d0686ecd1b1cc4c59a9b
Reviewed-on: https://skia-review.googlesource.com/123501
Auto-Submit: Cary Clark <caryclark@skia.org>
Commit-Queue: Leon Scroggins <scroggo@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
4 files changed