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353   // Add/remove observer.
354   void AddObserver(WidgetObserver* observer);
355   void RemoveObserver(WidgetObserver* observer);
356   bool HasObserver(WidgetObserver* observer);
358   // Add/remove removals observer.
359   void AddRemovalsObserver(WidgetRemovalsObserver* observer);
360   void RemoveRemovalsObserver(WidgetRemovalsObserver* observer);
361   bool HasRemovalsObserver(WidgetRemovalsObserver* observer);