Enumerate the return value of dispatchEvent so it is clear.

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

 /*
  * 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 11 matching lines @@
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef IDBEventDispatcher_h
 #define IDBEventDispatcher_h
 
+#include "core/events/EventTarget.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Allocator.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class Event;
-class EventTarget;
 
 class IDBEventDispatcher {
     STATIC_ONLY(IDBEventDispatcher);
 public:
-    static bool dispatch(Event*, WillBeHeapVector<RefPtrWillBeMember<EventTarget>>&); // The target first and then its ancestors in order of how the event bubbles.
+    static DispatchEventResult dispatch(Event*, WillBeHeapVector<RefPtrWillBeMember<EventTarget>>&); // The target first and then its ancestors in order of how the event bubbles.
 };
 
 } // namespace blink
 
 #endif // IDBEventDispatcher_h