Remove `Type::containsPrivateFields`.

`Type::isPrivate` now works properly even on structs and arrays, so we
don't need two separate methods anymore.

Change-Id: Ic3e16e1315ebb0c8cec575f109af7e472a11ac8c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/455660
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
4 files changed