Rename xfa_doclayout and xfa_document_layout_imp files.

xfa/fxfa/parser/cxfa_traversestrategy_layoutitem.h

+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef XFA_FXFA_PARSER_CXFA_TRAVERSESTRATEGY_LAYOUTITEM_H_
+#define XFA_FXFA_PARSER_CXFA_TRAVERSESTRATEGY_LAYOUTITEM_H_
+
+#include "xfa/fxfa/parser/cxfa_layoutitem.h"
+
+class CXFA_TraverseStrategy_LayoutItem {
+ public:
+  static CXFA_LayoutItem* GetFirstChild(CXFA_LayoutItem* pLayoutItem) {
+    return pLayoutItem->m_pFirstChild;
+  }
+  static CXFA_LayoutItem* GetNextSibling(CXFA_LayoutItem* pLayoutItem) {
+    return pLayoutItem->m_pNextSibling;
+  }
+  static CXFA_LayoutItem* GetParent(CXFA_LayoutItem* pLayoutItem) {
+    return pLayoutItem->m_pParent;
+  }
+};
+
+#endif  // XFA_FXFA_PARSER_CXFA_TRAVERSESTRATEGY_LAYOUTITEM_H_