Remove more iOS sample code

I think this is generally obsoleted by sk_app?

Bug: skia:
Change-Id: Ie8e9dd1f11f2d2f97f0a21a7e79b37755e75cd44
Reviewed-on: https://skia-review.googlesource.com/74161
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
44 files changed