Chris Bracken a6f0be9844 Fix unguarded availability warnings for iOS (flutter/engine#4664)
Place all iOS code that relies on APIs introduced in iOS versions later
than our base SDK version (iOS 8) behind @available checks. This allows
us to enable the -Wunguarded-availability compiler flag for iOS builds
in the buildroot repo.
2018-02-13 11:49:43 -08:00
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