[Fontations] Use Skrifa's NullPen instead of custom pen

Drop custom NoOpPen implementation.

Cq-Include-Trybots: luci.skia.skia.primary:Build-Debian10-Clang-x86_64-Debug-Fontations,Build-Mac-Clang-x86_64-Debug-Fontations,Test-Debian10-Clang-GCE-CPU-AVX2-x86_64-Debug-All-NativeFonts_Fontations,Test-Mac12-Clang-MacBookPro16.2-CPU-AppleIntel-x86_64-Debug-All-NativeFonts_Fontations
Change-Id: Ibb3a14758dd74cdf10456d46615e2b9f1aee0d9b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/905156
Reviewed-by: Dominik Röttsches <drott@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Dominik Röttsches <drott@google.com>
1 file changed