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Migrates `FlutterViewController` from manual reference counting to ARC. Eliminates use of scoped_nsobject and scoped_nsprotocol, and migrates ivars to property syntax where possible. No semantic changes, therefore no changes to tests. Issue: https://github.com/flutter/flutter/issues/137801 [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style