Adrian Secord 267685b31a Revert "[Dialogs] Explicitly annotate MDCAlertController as not subclassable (#2801)"
Multiple internal breakages from fairly innocuous-looking subclasses.

This reverts commit d70ebaa194591c68e9fb7e4d755b93f56aabe703.
2018-01-08 10:28:28 -05:00
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