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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 `FlutterEmbedderKeyResponder` from MRC to ARC. Clean up some header imports which made this seem like it depended on not-yet-migrated MRC files. Part of https://github.com/flutter/flutter/issues/137801.