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Migrates the FlutterAppDelegate.mm translation unit to be compiled with the `-fobjc-arc` compiler flag.
No test changes since no this change includes no semantic changes, and thus covered by existing tests such as [`testReleasesWindowOnDealloc`](f6e580d09a/shell/platform/darwin/ios/framework/Source/FlutterAppDelegateTest.mm (L139-L153)).
Issue: https://github.com/flutter/flutter/issues/137801
[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style