Remove duplicated headers from modules/ directory

Source/modules/indexeddb/IDBRequest.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 22 matching lines @@
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/DOMError.h"
 #include "core/dom/DOMStringList.h"
 #include "core/events/Event.h"
 #include "core/events/EventListener.h"
 #include "core/events/EventTarget.h"
 #include "core/events/ThreadLocalEventNames.h"
 #include "modules/indexeddb/IDBAny.h"
 #include "modules/indexeddb/IDBCursor.h"
+#include "modules/indexeddb/IDBTransaction.h"
 #include "modules/indexeddb/IndexedDB.h"
 #include "public/platform/WebIDBCursor.h"
 
 namespace WebCore {
 
 class ExceptionState;
 struct IDBDatabaseMetadata;
-class IDBTransaction;
 class SharedBuffer;
 
 // Base class to simplify usage of event target refcounting.
 class IDBRequestBase : public WTF::RefCountedBase {
 public:
     virtual void deref() = 0;
 
 protected:
     virtual ~IDBRequestBase() { }
 };
@@ skipping 113 matching lines @@
     bool m_didFireUpgradeNeededEvent;
     bool m_preventPropagation;
     bool m_resultDirty;
 
     DOMRequestState m_requestState;
 };
 
 } // namespace WebCore
 
 #endif // IDBRequest_h