@class NSObject; @protocol OS_dispatch_queue; @interface _COMediaSystemLeaderObserver : NSObject @property (readonly, nonatomic) NSObject<OS_dispatch_queue> *dispatchQueue; @property (readonly, copy, nonatomic) id /* block */ block; - (void).cxx_destruct; - (id)initWithDispatchQueue:(id)a0 block:(id /* block */)a1; @end