Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/core/events/WheelEvent.cpp

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2005, 2006, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 89 matching lines @@
     return false;
 }
 
 bool WheelEvent::isWheelEvent() const
 {
     return true;
 }
 
 PassRefPtrWillBeRawPtr<EventDispatchMediator> WheelEvent::createMediator()
 {
-    return WheelEventDispatchMediator::create(this);
+    return EventDispatchMediator::create(this);
 }
 
 DEFINE_TRACE(WheelEvent)
 {
     MouseEvent::trace(visitor);
 }
 
-PassRefPtrWillBeRawPtr<WheelEventDispatchMediator> WheelEventDispatchMediator::create(PassRefPtrWillBeRawPtr<WheelEvent> event)
-{
-    return adoptRefWillBeNoop(new WheelEventDispatchMediator(event));
-}
-
-WheelEventDispatchMediator::WheelEventDispatchMediator(PassRefPtrWillBeRawPtr<WheelEvent> event)
-    : EventDispatchMediator(event)
-{
-}
-
-WheelEvent& WheelEventDispatchMediator::event() const
-{
-    return toWheelEvent(EventDispatchMediator::event());
-}
-
-bool WheelEventDispatchMediator::dispatchEvent(EventDispatcher& dispatcher) const
-{
-    return EventDispatchMediator::dispatchEvent(dispatcher) && !event().defaultHandled();
-}
-
 } // namespace blink