Remove SkFontArguments::Axis.

Replaced with SkFontArguments::VariationPosition and
SkFontArguments::VariationPosition::Coordinate since the arguments are
about a variation specification and it's coordinates.
SkFontParameters::Axis actually deals with axes and their properties.

Change-Id: I377c9c5efa8e7b7e2649fc038f765062e30391e5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/302905
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed