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

xfa/fxfa/parser/cxfa_widetextread.cpp

Index: xfa/fxfa/parser/cxfa_widetextread.cpp
diff --git a/xfa/fxfa/parser/cxfa_widetextread.cpp b/xfa/fxfa/parser/cxfa_widetextread.cpp
index 54442df7c032e61d6f893a77dc63b626d255e935..34fa6b9c5e5144132cc4be345c717606275e0d47 100644
--- a/xfa/fxfa/parser/cxfa_widetextread.cpp
+++ b/xfa/fxfa/parser/cxfa_widetextread.cpp
@@ -14,6 +14,8 @@
 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;
 }