
This replaces a few ARC bridged retain casts to regular bridge casts to CoreFoundation types, which are then CFRetained via `sk_cfp::retain` calls. This eliminates the last remaining unnecessary __bridge_retained casts in the codebase. The remaining casts have been manually vetted and are reasonable. Issue: https://github.com/flutter/flutter/issues/155943 [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style