Revert "Use skcms_PrimariesToXYZD50 to implement SkColorSpacePrimaries::toXYZD50"

This reverts commit 887b416bf59288b545adea661e19c0806ce68bfb.

Reason for revert: layout tests?

Original change's description:
> Use skcms_PrimariesToXYZD50 to implement SkColorSpacePrimaries::toXYZD50
> 
> Two copies of this code is one too many.
> 
> Change-Id: I57d1426d1b0ba8340c0ac1e2dbc1b1422994ea2b
> Reviewed-on: https://skia-review.googlesource.com/150381
> Commit-Queue: Brian Osman <brianosman@google.com>
> Commit-Queue: Mike Klein <mtklein@google.com>
> Auto-Submit: Brian Osman <brianosman@google.com>
> Reviewed-by: Mike Klein <mtklein@google.com>

TBR=mtklein@google.com,brianosman@google.com

Change-Id: I332089462bf2e3234306251cd92ccc6389954f0f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/150367
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed