Remove swizzle helper function for type creation

Change-Id: I7bc393239dbb66c08fbd24eccfc997adc78248c3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/317103
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed