Enumerate the return value of dispatchEvent so it is clear.

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

 /*
  * Copyright (C) 2012 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 40 matching lines @@
     // EventTarget
     const AtomicString& interfaceName() const override;
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(blocked);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(upgradeneeded);
 
 protected:
     bool shouldEnqueueEvent() const override;
 
     // EventTarget
-    bool dispatchEventInternal(PassRefPtrWillBeRawPtr<Event>) override;
+    DispatchEventResult dispatchEventInternal(PassRefPtrWillBeRawPtr<Event>) override;
 
 private:
     IDBOpenDBRequest(ScriptState*, IDBDatabaseCallbacks*, int64_t transactionId, int64_t version);
 
     Member<IDBDatabaseCallbacks> m_databaseCallbacks;
     const int64_t m_transactionId;
     int64_t m_version;
 };
 
 } // namespace blink
 
 #endif // IDBOpenDBRequest_h