Rename IFX_Unknown to IFX_Retainable.

xfa/fde/css/fde_css.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_CSS_H_
 #define XFA_FDE_CSS_FDE_CSS_H_
 
 #include "core/fxge/include/fx_dib.h"
@@ skipping 721 matching lines @@
   virtual int32_t CountRules() const = 0;
   virtual IFDE_CSSRule* GetRule(int32_t index) = 0;
 };
 
 class IFDE_CSSFontFaceRule : public IFDE_CSSRule {
  public:
   virtual FDE_CSSRULETYPE GetType() const { return FDE_CSSRULETYPE_FontFace; }
   virtual CFDE_CSSDeclaration* GetDeclaration() = 0;
 };
 
-class IFDE_CSSStyleSheet : public IFX_Unknown {
+class IFDE_CSSStyleSheet : public IFX_Retainable {
  public:
   static IFDE_CSSStyleSheet* LoadHTMLStandardStyleSheet();
   static IFDE_CSSStyleSheet* LoadFromStream(
       const CFX_WideString& szUrl,
       IFX_Stream* pStream,
       uint16_t wCodePage,
       uint32_t dwMediaList = FDE_CSSMEDIATYPE_ALL);
   static IFDE_CSSStyleSheet* LoadFromBuffer(
       const CFX_WideString& szUrl,
       const FX_WCHAR* pBuffer,
@@ skipping 122 matching lines @@
   virtual uint32_t GetTextDecoration() const = 0;
   virtual const FDE_CSSLENGTH& GetLetterSpacing() const = 0;
   virtual void SetLineHeight(FX_FLOAT fLineHeight) = 0;
   virtual void SetTextIndent(const FDE_CSSLENGTH& textIndent) = 0;
   virtual void SetTextAlign(FDE_CSSTEXTALIGN eTextAlign) = 0;
   virtual void SetNumberVerticalAlign(FX_FLOAT fAlign) = 0;
   virtual void SetTextDecoration(uint32_t dwTextDecoration) = 0;
   virtual void SetLetterSpacing(const FDE_CSSLENGTH& letterSpacing) = 0;
 };
 
-class IFDE_CSSComputedStyle : public IFX_Unknown {
+class IFDE_CSSComputedStyle : public IFX_Retainable {
  public:
   virtual void Reset() = 0;
   virtual IFDE_CSSFontStyle* GetFontStyles() = 0;
   virtual IFDE_CSSBoundaryStyle* GetBoundaryStyles() = 0;
   virtual IFDE_CSSPositionStyle* GetPositionStyles() = 0;
   virtual IFDE_CSSParagraphStyle* GetParagraphStyles() = 0;
   virtual FX_BOOL GetCustomStyle(const CFX_WideStringC& wsName,
                                  CFX_WideString& wsValue) const = 0;
 };
 
 #endif  // XFA_FDE_CSS_FDE_CSS_H_