Remove old iOSShell code

Bug: skia:
Change-Id: Ia737ee97b145aa637641454aff211af00049a460
Reviewed-on: https://skia-review.googlesource.com/74661
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed