Rename IFX_Unknown to IFX_Retainable.

core/fxcrt/include/fx_basic.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 CORE_FXCRT_INCLUDE_FX_BASIC_H_
 #define CORE_FXCRT_INCLUDE_FX_BASIC_H_
 
 #include <algorithm>
@@ skipping 893 matching lines @@
 
   T2* GetPtrAt(int32_t nIndex) { return (T2*)m_Data.GetAt(nIndex); }
 
  protected:
   T1 m_Data;
 };
 typedef CFX_ListArrayTemplate<CFX_SortListArray<sizeof(FX_FILESIZE)>,
                               FX_FILESIZE> CFX_FileSizeListArray;
 
 #ifdef PDF_ENABLE_XFA
-class IFX_Unknown {
+class IFX_Retainable {
  public:
-  virtual ~IFX_Unknown() {}
+  virtual uint32_t Retain() = 0;
   virtual uint32_t Release() = 0;
-  virtual uint32_t AddRef() = 0;
+
+ protected:
+  virtual ~IFX_Retainable() {}
 };
 #define FX_IsOdd(a) ((a)&1)
 #endif  // PDF_ENABLE_XFA
 
 class CFX_Vector_3by1 {
  public:
   CFX_Vector_3by1() : a(0.0f), b(0.0f), c(0.0f) {}
 
   CFX_Vector_3by1(FX_FLOAT a1, FX_FLOAT b1, FX_FLOAT c1)
       : a(a1), b(b1), c(c1) {}
@@ skipping 39 matching lines @@
   FX_FLOAT e;
   FX_FLOAT f;
   FX_FLOAT g;
   FX_FLOAT h;
   FX_FLOAT i;
 };
 
 uint32_t GetBits32(const uint8_t* pData, int bitpos, int nbits);
 
 #endif  // CORE_FXCRT_INCLUDE_FX_BASIC_H_