Catch stray Retains() and Releases() outside of RetainPtr<>.

xfa/fxfa/parser/cxfa_widetextread.cpp

 // 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
 
 #include "xfa/fxfa/parser/cxfa_widetextread.h"
 
 #include <algorithm>
 
 #include "core/fxcrt/fx_ext.h"
 #include "xfa/fgas/crt/fgas_codepage.h"
 
 CXFA_WideTextRead::CXFA_WideTextRead(const CFX_WideString& wsBuffer)
     : m_wsBuffer(wsBuffer), m_iPosition(0) {}
 
+CXFA_WideTextRead::~CXFA_WideTextRead() {}
+
 uint32_t CXFA_WideTextRead::GetAccessModes() const {
   return FX_STREAMACCESS_Read | FX_STREAMACCESS_Text;
 }
 
 int32_t CXFA_WideTextRead::GetLength() const {
   return m_wsBuffer.GetLength() * sizeof(FX_WCHAR);
 }
 
 int32_t CXFA_WideTextRead::Seek(FX_STREAMSEEK eSeek, int32_t iOffset) {
   switch (eSeek) {
@@ skipping 64 matching lines @@
 CFX_RetainPtr<IFGAS_Stream> CXFA_WideTextRead::CreateSharedStream(
     uint32_t dwAccess,
     int32_t iOffset,
     int32_t iLength) {
   return nullptr;
 }
 
 CFX_WideString CXFA_WideTextRead::GetSrcText() const {
   return m_wsBuffer;
 }