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

xfa/fxfa/parser/cxfa_widetextread.h

Index: xfa/fxfa/parser/cxfa_widetextread.h
diff --git a/xfa/fxfa/parser/cxfa_widetextread.h b/xfa/fxfa/parser/cxfa_widetextread.h
index d3d3b3792a10106e3b5f8a6a802d9d462810aa38..fc2994921509d1a8f36ed7b7333cf4e0c000b7df 100644
--- a/xfa/fxfa/parser/cxfa_widetextread.h
+++ b/xfa/fxfa/parser/cxfa_widetextread.h
@@ -7,12 +7,11 @@
 #ifndef XFA_FXFA_PARSER_CXFA_WIDETEXTREAD_H_
 #define XFA_FXFA_PARSER_CXFA_WIDETEXTREAD_H_
 
+#include "core/fxcrt/cfx_retain_ptr.h"
 #include "xfa/fgas/crt/fgas_stream.h"
 
 class CXFA_WideTextRead : public IFGAS_Stream {
  public:
-  explicit CXFA_WideTextRead(const CFX_WideString& wsBuffer);
-
   // IFGAS_Stream
   uint32_t GetAccessModes() const override;
   int32_t GetLength() const override;
@@ -35,6 +34,12 @@ class CXFA_WideTextRead : public IFGAS_Stream {
   CFX_WideString GetSrcText() const;
 
  protected:
+  template <typename T, typename... Args>
+  friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args);
+
+  explicit CXFA_WideTextRead(const CFX_WideString& wsBuffer);
+  ~CXFA_WideTextRead();
+
   CFX_WideString m_wsBuffer;
   int32_t m_iPosition;
 };