Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/core/html/HTMLFormControlElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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 521 matching lines @@
 
 bool HTMLFormControlElement::checkValidity(WillBeHeapVector<RefPtrWillBeMember<HTMLFormControlElement>>* unhandledInvalidControls, CheckValidityEventBehavior eventBehavior)
 {
     if (isValidElement())
         return true;
     if (eventBehavior != CheckValidityDispatchInvalidEvent)
         return false;
     // An event handler can deref this object.
     RefPtrWillBeRawPtr<HTMLFormControlElement> protector(this);
     RefPtrWillBeRawPtr<Document> originalDocument(document());
-    bool needsDefaultAction = dispatchEvent(Event::createCancelable(EventTypeNames::invalid));
-    if (needsDefaultAction && unhandledInvalidControls && inDocument() && originalDocument == document())
+    DispatchEventResult dispatchResult = dispatchEvent(Event::createCancelable(EventTypeNames::invalid));
+    if (dispatchResult == DispatchEventResult::NotCanceled && unhandledInvalidControls && inDocument() && originalDocument == document())
         unhandledInvalidControls->append(this);
     return false;
 }
 
 void HTMLFormControlElement::showValidationMessage()
 {
     scrollIntoViewIfNeeded(false);
     RefPtrWillBeRawPtr<HTMLFormControlElement> protector(this);
     focus();
     updateVisibleValidationMessage();
@@ skipping 108 matching lines @@
         dispatchFormControlChangeEvent();
 }
 
 void HTMLFormControlElement::copyNonAttributePropertiesFromElement(const Element& source)
 {
     HTMLElement::copyNonAttributePropertiesFromElement(source);
     setNeedsValidityCheck();
 }
 
 } // namespace blink