Simplify XFA event handling.

xfa/fxfa/parser/xfa_layout_appadapter.cpp

 // Copyright 2014 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
 
 #include "xfa/fxfa/parser/xfa_layout_appadapter.h"
 
 #include "xfa/fxfa/app/xfa_ffnotify.h"
 #include "xfa/fxfa/fm2js/xfa_fm2jsapi.h"
@@ skipping 32 matching lines @@
 }
 void XFA_ReleaseLayoutItem(CXFA_LayoutItem* pLayoutItem) {
   CXFA_LayoutItem* pNode = pLayoutItem->m_pFirstChild;
   CXFA_FFNotify* pNotify =
       pLayoutItem->m_pFormNode->GetDocument()->GetParser()->GetNotify();
   CXFA_LayoutProcessor* pDocLayout =
       pLayoutItem->m_pFormNode->GetDocument()->GetDocLayout();
   while (pNode) {
     CXFA_LayoutItem* pNext = pNode->m_pNextSibling;
     pNode->m_pParent = nullptr;
-    pNotify->OnLayoutEvent(pDocLayout, static_cast<CXFA_LayoutItem*>(pNode),
-                           XFA_LAYOUTEVENT_ItemRemoving);
+    pNotify->OnLayoutItemRemoving(pDocLayout,
+                                  static_cast<CXFA_LayoutItem*>(pNode));
     XFA_ReleaseLayoutItem(pNode);
     pNode = pNext;
   }
-  pNotify->OnLayoutEvent(pDocLayout, pLayoutItem, XFA_LAYOUTEVENT_ItemRemoving);
+  pNotify->OnLayoutItemRemoving(pDocLayout, pLayoutItem);
   if (pLayoutItem->m_pFormNode->GetClassID() == XFA_ELEMENT_PageArea) {
     pNotify->OnPageEvent(static_cast<CXFA_ContainerLayoutItem*>(pLayoutItem),
                          XFA_PAGEEVENT_PageRemoved);
   }
   delete pLayoutItem;
 }