Remove guard and legacy behavior for edge AA flag checks
Remove guard and legacy behavior for edge AA flag checks

Change-Id: I8de02cd5c8d0e70b2cf1ac2d359507814c984ff6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/533806
Commit-Queue: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>
Auto-Submit: Michael Ludwig <cb1f3dd24de0f0b611b26bc28bec758a551d9b7d@google.com>
Reviewed-by: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>

google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia