Rework dispatchEvent so it is consistent for isTrusted support.

Source/modules/indexeddb/IDBOpenDBRequest.h

Index: Source/modules/indexeddb/IDBOpenDBRequest.h
diff --git a/Source/modules/indexeddb/IDBOpenDBRequest.h b/Source/modules/indexeddb/IDBOpenDBRequest.h
index b460ab723ed5a2ce8bd0578f386a2b05ef1a70a1..d02df47bf4d022c64b6c26f4a6daafe18f92fa8c 100644
--- a/Source/modules/indexeddb/IDBOpenDBRequest.h
+++ b/Source/modules/indexeddb/IDBOpenDBRequest.h
@@ -50,7 +50,6 @@ public:
 
     // EventTarget
     const AtomicString& interfaceName() const override;
-    bool dispatchEvent(PassRefPtrWillBeRawPtr<Event>) override;
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(blocked);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(upgradeneeded);
@@ -58,6 +57,9 @@ public:
 protected:
     bool shouldEnqueueEvent() const override;
 
+    // EventTarget
+    bool dispatchEventInternal(PassRefPtrWillBeRawPtr<Event>) override;
+
 private:
     IDBOpenDBRequest(ScriptState*, IDBDatabaseCallbacks*, int64_t transactionId, int64_t version);