Remove legacy getFillPath from SkPaint

All clients should be migrated to skpathutils::FillPathWithPaint

Change-Id: Icd75c905e66f6e9742f5c75b94f20da0029a3b5e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/620138
Reviewed-by: Brian Osman <brianosman@google.com>
3 files changed