Remove { delete this; } anti-pattern from IXFA_WidgetIterator

fpdfsdk/fsdk_mgr.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 "fpdfsdk/include/fsdk_mgr.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 887 matching lines @@
   CPDF_InterForm::EnableUpdateAP(enableAPUpdate);
   const size_t nCount = m_pAnnotList->Count();
 #endif  // PDF_ENABLE_XFA
 
   SetLock(TRUE);
 
 #ifdef PDF_ENABLE_XFA
   m_page->AddRef();
   if (m_pSDKDoc->GetXFADocument()->GetDocType() == DOCTYPE_DYNAMIC_XFA) {
     CXFA_FFPageView* pageView = m_page->GetXFAPageView();
-    IXFA_WidgetIterator* pWidgetHander = pageView->CreateWidgetIterator(
-        XFA_TRAVERSEWAY_Form, XFA_WIDGETFILTER_Visible |
-                                  XFA_WIDGETFILTER_Viewable |
-                                  XFA_WIDGETFILTER_AllType);
+    std::unique_ptr<IXFA_WidgetIterator> pWidgetHander(
+        pageView->CreateWidgetIterator(XFA_TRAVERSEWAY_Form,
+                                       XFA_WIDGETFILTER_Visible |
+                                           XFA_WIDGETFILTER_Viewable |
+                                           XFA_WIDGETFILTER_AllType));
     if (!pWidgetHander) {
       m_page->Release();
       SetLock(FALSE);
       return;
     }
 
     while (CXFA_FFWidget* pXFAAnnot = pWidgetHander->MoveToNext()) {
       CPDFSDK_Annot* pAnnot = pAnnotHandlerMgr->NewAnnot(pXFAAnnot, this);
       if (!pAnnot)
         continue;
-
       m_fxAnnotArray.push_back(pAnnot);
       pAnnotHandlerMgr->Annot_OnLoad(pAnnot);
     }
-    pWidgetHander->Release();
   } else {
     CPDF_Page* pPage = m_page->GetPDFPage();
     ASSERT(pPage);
     FX_BOOL enableAPUpdate = CPDF_InterForm::UpdatingAPEnabled();
     // Disable the default AP construction.
     CPDF_InterForm::EnableUpdateAP(FALSE);
     m_pAnnotList.reset(new CPDF_AnnotList(pPage));
     CPDF_InterForm::EnableUpdateAP(enableAPUpdate);
 
     const size_t nCount = m_pAnnotList->Count();
@@ skipping 78 matching lines @@
   CPDFSDK_Annot* pFocusAnnot = m_pSDKDoc->GetFocusAnnot();
   if (!pFocusAnnot)
     return nullptr;
 
   for (CPDFSDK_Annot* pAnnot : m_fxAnnotArray) {
     if (pAnnot == pFocusAnnot)
       return pAnnot;
   }
   return nullptr;
 }