Remove obsolete iOSShell references from infra scripts

Bug: skia:
Change-Id: I36cb94877d513fc81c211b0e58b5c4be0451ac91
Reviewed-on: https://skia-review.googlesource.com/74601
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
57 files changed