ios: Fix API deprecation error in iOS13.
ios: Fix API deprecation error in iOS13.

UI_USER_INTERFACE_IDIOM is deprecated in iOS13. Instead use
-[UIDevice userInterfaceIdiom] directly.

Bug: crashpad: 31
Change-Id: I0bdcc3b3b42bd2ca87cee26abedbeb5b89632981
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2826575
Reviewed-by: Mark Mentovai <f1b5a91d4d6ad523f2610114591c007e75d15084@chromium.org>
Commit-Queue: Justin Cohen <45f934f548b3ee92957d72fd2179b802430e9402@chromium.org>

chromium/crashpad,chromium/crashpad,chromium/crashpad