Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/core/events/GestureEvent.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 40 matching lines @@
 
     float deltaX() const { return m_deltaX; }
     float deltaY() const { return m_deltaY; }
     float velocityX() const { return m_velocityX; }
     float velocityY() const { return m_velocityY; }
     bool inertial() const { return m_inertial; }
 
     GestureSource source() const { return m_source; }
     int resendingPluginId() const { return m_resendingPluginId; }
 
-    PassRefPtrWillBeRawPtr<EventDispatchMediator> createMediator() override;
-
     DECLARE_VIRTUAL_TRACE();
 
 private:
     GestureEvent();
     GestureEvent(const AtomicString& type, PassRefPtrWillBeRawPtr<AbstractView>, int screenX, int screenY, int clientX, int clientY, PlatformEvent::Modifiers, float deltaX, float deltaY, float velocityX, float velocityY, bool inertial, double platformTimeStamp, int resendingPluginId, GestureSource);
 
     float m_deltaX;
     float m_deltaY;
     float m_velocityX;
     float m_velocityY;
     bool m_inertial;
 
     GestureSource m_source;
     int m_resendingPluginId;
 };
 
-class GestureEventDispatchMediator final : public EventDispatchMediator {
-public:
-    static PassRefPtrWillBeRawPtr<GestureEventDispatchMediator> create(PassRefPtrWillBeRawPtr<GestureEvent> gestureEvent)
-    {
-        return adoptRefWillBeNoop(new GestureEventDispatchMediator(gestureEvent));
-    }
-
-private:
-    explicit GestureEventDispatchMediator(PassRefPtrWillBeRawPtr<GestureEvent>);
-
-    GestureEvent& event() const;
-
-    bool dispatchEvent(EventDispatcher&) const override;
-};
-
 DEFINE_EVENT_TYPE_CASTS(GestureEvent);
 
 } // namespace blink
 
 #endif // GestureEvent_h