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31f79201a8
Smart pointers support ARC as of https://github.com/flutter/engine/pull/47612, and the unit tests were migrated in https://github.com/flutter/engine/pull/48162. Migrate`FlutterCallbackCache` and `FlutterKeyboardManager` from MRC to ARC. These files do not themselves import any MRC files, making them leaf nodes in the dependency graph of MRC files. Doing a few at a time to make the dependency graph manageable, and to easily revert if this causes retain cycles or other memory management issues. Part of https://github.com/flutter/flutter/issues/137801.