Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/modules/indexeddb/IDBTransaction.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 86 matching lines @@
     // EventTarget
     const AtomicString& interfaceName() const override;
     ExecutionContext* executionContext() const override;
 
     // ActiveDOMObject
     bool hasPendingActivity() const override;
     void stop() override;
 
 protected:
     // EventTarget
-    bool dispatchEventInternal(PassRefPtrWillBeRawPtr<Event>) override;
+    DispatchEventResult dispatchEventInternal(PassRefPtrWillBeRawPtr<Event>) override;
 
 private:
     IDBTransaction(ScriptState*, int64_t, const HashSet<String>&, WebIDBTransactionMode, IDBDatabase*, IDBOpenDBRequest*, const IDBDatabaseMetadata&);
 
     void enqueueEvent(PassRefPtrWillBeRawPtr<Event>);
 
     enum State {
         Inactive, // Created or started, but not in an event callback
         Active, // Created or started, in creation scope or an event callback
         Finishing, // In the process of aborting or completing.
@@ skipping 16 matching lines @@
     IDBObjectStoreMap m_objectStoreMap;
 
     HeapHashSet<Member<IDBObjectStore>> m_deletedObjectStores;
     HeapHashMap<Member<IDBObjectStore>, IDBObjectStoreMetadata> m_objectStoreCleanupMap;
     IDBDatabaseMetadata m_previousMetadata;
 };
 
 } // namespace blink
 
 #endif // IDBTransaction_h