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Refactor core uses of FlutterError. (#30983)

Make FlutterError objects more structured so they can be displayed better in debugging tools such as Dart DevTools.
J
Jacob Richman committed
63aa5b3647dbd912a02f7545fc0101003cb3adc4
Parent: f8dfa36
Committed by GitHub <noreply@github.com> on 5/1/2019, 6:20:12 PM