Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/modules/indexeddb/IDBDatabase.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 116 matching lines @@
     static const char sourceDeletedErrorMessage[];
     static const char transactionFinishedErrorMessage[];
     static const char transactionInactiveErrorMessage[];
     static const char transactionReadOnlyErrorMessage[];
     static const char databaseClosedErrorMessage[];
 
     static void recordApiCallsHistogram(IndexedDatabaseMethods);
 
 protected:
     // EventTarget
-    bool dispatchEventInternal(PassRefPtrWillBeRawPtr<Event>) override;
+    DispatchEventResult dispatchEventInternal(PassRefPtrWillBeRawPtr<Event>) override;
 
 private:
     IDBDatabase(ExecutionContext*, PassOwnPtr<WebIDBDatabase>, IDBDatabaseCallbacks*);
 
     IDBObjectStore* createObjectStore(const String& name, const IDBKeyPath&, bool autoIncrement, ExceptionState&);
     void closeConnection();
 
     IDBDatabaseMetadata m_metadata;
     OwnPtr<WebIDBDatabase> m_backend;
     Member<IDBTransaction> m_versionChangeTransaction;
     HeapHashMap<int64_t, Member<IDBTransaction>> m_transactions;
 
     bool m_closePending = false;
     bool m_contextStopped = false;
 
     // Keep track of the versionchange events waiting to be fired on this
     // database so that we can cancel them if the database closes.
     WillBeHeapVector<RefPtrWillBeMember<Event>> m_enqueuedEvents;
 
     Member<IDBDatabaseCallbacks> m_databaseCallbacks;
 };
 
 } // namespace blink
 
 #endif // IDBDatabase_h