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Refactor of cupertino/material/widgets app (#22161)

* Make CupertinoApp and MaterialApp both use WidgetsApp for Navigator

* Make CupertinoApp and MaterialApp const constructors

* Make WidgetsApp routes aware

* Update tests
D
Dan Field committed
61cf946ba8c55c73c9119a203d07b8c025b6aa92
Parent: 6776352
Committed by GitHub <noreply@github.com> on 9/25/2018, 3:55:03 AM