Rework dispatchEvent so it is consistent for isTrusted support.

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 84 matching lines @@
 
     // EventTarget
     const AtomicString& interfaceName() const override;
     ExecutionContext* executionContext() const override;
 
     bool isClosePending() const { return m_closePending; }
     void forceClose();
     const IDBDatabaseMetadata& metadata() const { return m_metadata; }
     void enqueueEvent(PassRefPtrWillBeRawPtr<Event>);
 
-    using EventTarget::dispatchEvent;
-    bool dispatchEvent(PassRefPtrWillBeRawPtr<Event>) override;
-
     int64_t findObjectStoreId(const String& name) const;
     bool containsObjectStore(const String& name) const
     {
         return findObjectStoreId(name) != IDBObjectStoreMetadata::InvalidId;
     }
 
     // Will return nullptr if this database is stopped.
     WebIDBDatabase* backend() const { return m_backend.get(); }
 
     static int64_t nextTransactionId();
 
     static const char indexDeletedErrorMessage[];
     static const char isKeyCursorErrorMessage[];
     static const char noKeyOrKeyRangeErrorMessage[];
     static const char noSuchIndexErrorMessage[];
     static const char noSuchObjectStoreErrorMessage[];
     static const char noValueErrorMessage[];
     static const char notValidKeyErrorMessage[];
     static const char notVersionChangeTransactionErrorMessage[];
     static const char objectStoreDeletedErrorMessage[];
     static const char requestNotFinishedErrorMessage[];
     static const char sourceDeletedErrorMessage[];
     static const char transactionFinishedErrorMessage[];
     static const char transactionInactiveErrorMessage[];
     static const char transactionReadOnlyErrorMessage[];
     static const char databaseClosedErrorMessage[];
     static const char notValidMaxCountErrorMessage[];
 
+protected:
+    bool dispatchEventInternal(PassRefPtrWillBeRawPtr<Event>) override;

[tkent, 2015/07/15 00:00:54]

I recommend to add a comment indicating what this overrides.  e.g.
    // EventTarget
Because the original code has such comment.

Same for other header files.

[dtapuska, 2015/07/15 22:34:42]

Done.

+
 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;
     typedef HeapHashMap<int64_t, Member<IDBTransaction>> TransactionMap;
     TransactionMap m_transactions;
 
     bool m_closePending;
     bool m_contextStopped;
 
     // 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