Do not check pointers before deleting them.

xfa/fxfa/app/xfa_ffdocview.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/include/xfa_ffdocview.h"
 
 #include "core/fxcrt/include/fx_ext.h"
 #include "xfa/fxfa/app/xfa_ffbarcode.h"
@@ skipping 44 matching lines @@
       m_pListFocusWidget(nullptr),
       m_bInLayoutStatus(FALSE),
       m_pDoc(pDoc),
       m_pWidgetHandler(nullptr),
       m_pXFADocLayout(nullptr),
       m_pFocusAcc(nullptr),
       m_pFocusWidget(nullptr),
       m_pOldFocusWidget(nullptr),
       m_iStatus(XFA_DOCVIEW_LAYOUTSTATUS_None),
       m_iLock(0) {}
+
 CXFA_FFDocView::~CXFA_FFDocView() {
   DestroyDocView();
-  if (m_pWidgetHandler) {
-    delete m_pWidgetHandler;
-  }
-  m_pWidgetHandler = NULL;
+  delete m_pWidgetHandler;
 }
+
 void CXFA_FFDocView::InitLayout(CXFA_Node* pNode) {
   RunBindItems();
   ExecEventActivityByDeepFirst(pNode, XFA_EVENT_Initialize);
   ExecEventActivityByDeepFirst(pNode, XFA_EVENT_IndexChange);
 }
 int32_t CXFA_FFDocView::StartLayout(int32_t iStartPage) {
   m_iStatus = XFA_DOCVIEW_LAYOUTSTATUS_Start;
   m_pDoc->GetXFADoc()->DoProtoMerge();
   m_pDoc->GetXFADoc()->DoDataMerge();
   m_pXFADocLayout = GetXFALayout();
@@ skipping 818 matching lines @@
 CXFA_WidgetAcc* CXFA_WidgetAccIterator::GetCurrentWidgetAcc() {
   return NULL;
 }
 FX_BOOL CXFA_WidgetAccIterator::SetCurrentWidgetAcc(CXFA_WidgetAcc* hWidget) {
   return FALSE;
 }
 void CXFA_WidgetAccIterator::SkipTree() {
   m_ContentIterator.SkipChildrenAndMoveToNext();
   m_pCurWidgetAcc = NULL;
 }