Rework dispatchEvent so it is consistent for isTrusted support.

Source/modules/indexeddb/IDBDatabase.h

Index: Source/modules/indexeddb/IDBDatabase.h
diff --git a/Source/modules/indexeddb/IDBDatabase.h b/Source/modules/indexeddb/IDBDatabase.h
index 31f5d2de4618ef5e556273734bddc0f6b27c8625..17da59a4e6166ce09dff1485dad9ffd4e6522e18 100644
--- a/Source/modules/indexeddb/IDBDatabase.h
+++ b/Source/modules/indexeddb/IDBDatabase.h
@@ -102,9 +102,6 @@ public:
     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
     {
@@ -133,6 +130,10 @@ public:
     static const char databaseClosedErrorMessage[];
     static const char notValidMaxCountErrorMessage[];
 
+protected:
+    // EventTarget
+    bool dispatchEventInternal(PassRefPtrWillBeRawPtr<Event>) override;
+
 private:
     IDBDatabase(ExecutionContext*, PassOwnPtr<WebIDBDatabase>, IDBDatabaseCallbacks*);