Move custom element code to core/dom/custom/

Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 12 matching lines @@
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef Document_h
 #define Document_h
 
 #include "bindings/v8/ScriptValue.h"
 #include "core/dom/ContainerNode.h"
-#include "core/dom/CustomElement.h"
 #include "core/dom/DOMTimeStamp.h"
 #include "core/dom/DocumentInit.h"
 #include "core/dom/DocumentLifecycle.h"
 #include "core/dom/DocumentTiming.h"
 #include "core/dom/IconURL.h"
 #include "core/dom/MutationObserver.h"
 #include "core/dom/QualifiedName.h"
 #include "core/dom/ScriptExecutionContext.h"
 #include "core/dom/TextLinkColors.h"
 #include "core/dom/TreeScope.h"
 #include "core/dom/UserActionElementSet.h"
 #include "core/dom/ViewportArguments.h"
+#include "core/dom/custom/CustomElement.h"
 #include "core/events/DocumentEventQueue.h"
 #include "core/html/CollectionType.h"
 #include "core/page/FocusDirection.h"
 #include "core/page/PageVisibilityState.h"
 #include "core/platform/Timer.h"
 #include "core/rendering/HitTestRequest.h"
 #include "weborigin/ReferrerPolicy.h"
 #include "wtf/HashSet.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
@@ skipping 1380 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == documentInternal();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h