Remove remaining CGFontCreateWithDataProvider support.
Remove remaining CGFontCreateWithDataProvider support.

Skia has moved to CTFontManagerCreateFontDescriptorFromData for creating
CTFonts directly. This means the awkward support for buggy CTFonts
created from CGFonts can be removed from the variation logic. Since
variations are already not supported on 10.11 and earlier this should
have no noticeable effect.

Change-Id: I9f8b0d70e1000c9a4f7b8c00670b80364432cee0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/299441
Reviewed-by: Herb Derby <9e12a3d2bbf73546e47cc9958f6ba8f3215b7eaf@google.com>
Commit-Queue: Ben Wagner <53965154ffeecc4a10886eab9259e95965f2979a@google.com>

aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia