Chris Bracken 6a4e814a68 iOS: Migrate FlutterHeadlessDartRunner to ARC (flutter/engine#55502)
This is a subclass of FlutterEngine, which is still manually reference counted, but that's not problematic since the headers have been migrated to ARC-safe syntax that preserves existing behaviour.

No test changes since this patch makes no semantic changes.

Issue: https://github.com/flutter/flutter/issues/137801

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
2024-09-30 16:47:07 +00:00
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