Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/core/frame/LocalDOMWindow.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 157 matching lines @@
 
     void postMessageTimerFired(PostMessageTimer*);
     void removePostMessageTimer(PostMessageTimer*);
     void dispatchMessageEventWithOriginCheck(SecurityOrigin* intendedTargetOrigin, PassRefPtrWillBeRawPtr<Event>, PassRefPtr<ScriptCallStack>);
 
     // Events
     // EventTarget API
     void removeAllEventListeners() override;
 
     using EventTarget::dispatchEvent;
-    bool dispatchEvent(PassRefPtrWillBeRawPtr<Event> prpEvent, PassRefPtrWillBeRawPtr<EventTarget> prpTarget);
+    DispatchEventResult dispatchEvent(PassRefPtrWillBeRawPtr<Event> prpEvent, PassRefPtrWillBeRawPtr<EventTarget> prpTarget);
 
     void finishedLoading();
 
     // Dispatch the (deprecated) orientationchange event to this DOMWindow and
     // recurse on its child frames.
     void sendOrientationChangeEvent();
 
     void willDetachDocumentFromFrame();
 
     EventQueue* eventQueue() const;
@@ skipping 94 matching lines @@
 }
 
 inline String LocalDOMWindow::defaultStatus() const
 {
     return m_defaultStatus;
 }
 
 } // namespace blink
 
 #endif // LocalDOMWindow_h