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Eliminates the two remaining uses of ScopedBlock and with it, ScopedTypeRef which was only used by ScopedBlock. ARC automatically generates the necessary block copy/retain/release calls, including moving blocks to the heap during a retain so manual _Block_copy/_Block_release calls are no longer required. No test changes since 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