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Migrates PlatformViewIOS from manual reference counting to ARC. Eliminates use of scoped_nsobject, scoped_nsprotocol, and WeakNSObject. Since this is the last non-ARC file in `flutter_framework_source`, this also eliminates the `flutter_framework_source` target, then also renames the `flutter_framework_source_arc` target to `flutter_framework_source` since... it's ALL ARC. No semantic changes, therefore no semantic 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