@class NSString, WBTabGroupManager, NSTimer; @interface _WBTabCyclerTabGroupUpdateObserver : NSObject <WBTabGroupManagerObserver> { id /* block */ _handler; WBTabGroupManager *_tabGroupManager; NSTimer *_timeoutTimer; BOOL _waitForTabGroups; } @property (readonly) unsigned long long hash; @property (readonly) Class superclass; @property (readonly, copy) NSString *description; @property (readonly, copy) NSString *debugDescription; + (id)observeTabGroupManager:(id)a0 waitForTabGroups:(BOOL)a1 handler:(id /* block */)a2; - (void)startObserving; - (void)_timeout; - (void).cxx_destruct; - (void)tabGroupManagerDidUpdateTabGroups:(id)a0; - (id)initWithTabGroupManager:(id)a0 handler:(id /* block */)a1; @end