Remove Release() from IFX_CharIter, use unique_ptrs.

xfa/fee/fde_txtedtengine.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/fee/fde_txtedtengine.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 936 matching lines @@
   ClearSelection();
   m_nCaret = 0;
   m_pTxtBuf->Clear(FALSE);
   m_nCaret = 0;
 }
 void CFDE_TxtEdtEngine::RebuildParagraphs() {
   RemoveAllParags();
   FX_WCHAR wChar = L' ';
   int32_t nParagStart = 0;
   int32_t nIndex = 0;
-  IFX_CharIter* pIter = new CFDE_TxtEdtBufIter((CFDE_TxtEdtBuf*)m_pTxtBuf);
+  std::unique_ptr<IFX_CharIter> pIter(
+      new CFDE_TxtEdtBufIter(static_cast<CFDE_TxtEdtBuf*>(m_pTxtBuf)));
   pIter->SetAt(0);
   do {
     wChar = pIter->GetChar();
     nIndex = pIter->GetAt();
     if (wChar == m_wLineEnd) {
       CFDE_TxtEdtParag* pParag = new CFDE_TxtEdtParag(this);
       pParag->SetStartIndex(nParagStart);
       pParag->SetTextLength(nIndex - nParagStart + 1);
       pParag->SetLineCount(-1);
       m_ParagPtrArray.Add(pParag);
       nParagStart = nIndex + 1;
     }
   } while (pIter->Next());
-  pIter->Release();
 }
 
 void CFDE_TxtEdtEngine::RemoveAllParags() {
   int32_t nCount = m_ParagPtrArray.GetSize();
   for (int i = 0; i < nCount; ++i)
     delete m_ParagPtrArray[i];
   m_ParagPtrArray.RemoveAll();
 }
 
 void CFDE_TxtEdtEngine::RemoveAllPages() {
@@ skipping 769 matching lines @@
   int32_t nEngine = 0;
   ArchiveLoader >> nEngine;
   m_pEngine = (CFDE_TxtEdtEngine*)(uintptr_t)nEngine;
   int32_t iSel = 0;
   ArchiveLoader >> iSel;
   m_bSel = !!iSel;
   ArchiveLoader >> m_nIndex;
   ArchiveLoader >> m_nCaret;
   ArchiveLoader >> m_wsRange;
 }