Refcount IFGAS_ streams all the time, too

xfa/fde/css/fde_cssstylesheet.h

 // 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
 
 #ifndef XFA_FDE_CSS_FDE_CSSSTYLESHEET_H_
 #define XFA_FDE_CSS_FDE_CSSSTYLESHEET_H_
 
 #include <memory>
@@ skipping 93 matching lines @@
   uint32_t Release() override;
 
   // IFDE_CSSStyleSheet:
   bool GetUrl(CFX_WideString& szUrl) override;
   uint32_t GetMediaList() const override;
   uint16_t GetCodePage() const override;
   int32_t CountRules() const override;
   IFDE_CSSRule* GetRule(int32_t index) override;
 
   bool LoadFromStream(const CFX_WideString& szUrl,
-                      IFGAS_Stream* pStream,
+                      const CFX_RetainPtr<IFGAS_Stream>& pStream,
                       uint16_t wCodePage);
   bool LoadFromBuffer(const CFX_WideString& szUrl,
                       const FX_WCHAR* pBuffer,
                       int32_t iBufSize,
                       uint16_t wCodePage);
 
  protected:
   void Reset();
   bool LoadFromSyntax(CFDE_CSSSyntaxParser* pSyntax);
   FDE_CSSSYNTAXSTATUS LoadStyleRule(
@@ skipping 10 matching lines @@
   uint16_t m_wRefCount;
   uint32_t m_dwMediaList;
   std::unique_ptr<IFX_MemoryAllocator> m_pAllocator;
   CFX_MassArrayTemplate<IFDE_CSSRule*> m_RuleArray;
   CFX_WideString m_szUrl;
   CFX_ArrayTemplate<CFDE_CSSSelector*> m_Selectors;
   std::unordered_map<uint32_t, FX_WCHAR*> m_StringCache;
 };
 
 #endif  // XFA_FDE_CSS_FDE_CSSSTYLESHEET_H_