4ae896bad0af replaced OS_MACOSX with OS_APPLE and introduced OS_MAC,
disentangled from OS_IOS. This allows !defined(OS_IOS) to be written
more directly as defined(OS_MAC) in cases where OS_APPLE is assured.
Change-Id: I8848503d3318038865dd4c8586a81ce82764af0a
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2384318
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>