Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/modules/indexeddb/IDBEventDispatcher.cpp

 /*
  * Copyright (C) 2010 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 15 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "modules/indexeddb/IDBEventDispatcher.h"
 
 #include "modules/EventModules.h"
 #include "modules/EventTargetModules.h"
 
 namespace blink {
 
-bool IDBEventDispatcher::dispatch(Event* event, WillBeHeapVector<RefPtrWillBeMember<EventTarget>>& eventTargets)
+DispatchEventResult IDBEventDispatcher::dispatch(Event* event, WillBeHeapVector<RefPtrWillBeMember<EventTarget>>& eventTargets)
 {
     size_t size = eventTargets.size();
     ASSERT(size);
 
     event->setEventPhase(Event::CAPTURING_PHASE);
     for (size_t i = size - 1; i; --i) { // Don't do the first element.
         event->setCurrentTarget(eventTargets[i].get());
         eventTargets[i]->fireEventListeners(event);
         if (event->propagationStopped())
             goto doneDispatching;
     }
 
     event->setEventPhase(Event::AT_TARGET);
     event->setCurrentTarget(eventTargets[0].get());
     eventTargets[0]->fireEventListeners(event);
     if (event->propagationStopped() || !event->bubbles() || event->cancelBubble())
         goto doneDispatching;
 
     event->setEventPhase(Event::BUBBLING_PHASE);
     for (size_t i = 1; i < size; ++i) { // Don't do the first element.
         event->setCurrentTarget(eventTargets[i].get());
         eventTargets[i]->fireEventListeners(event);
         if (event->propagationStopped() || event->cancelBubble())
             goto doneDispatching;
     }
 
 doneDispatching:
     event->setCurrentTarget(nullptr);
     event->setEventPhase(Event::NONE);
-    return !event->defaultPrevented();
+    return EventTarget::dispatchEventResult(*event);
 }
 
 } // namespace blink