Rename IFX_Unknown to IFX_Retainable.

xfa/fde/css/fde_cssstylesheet.cpp

 // 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
 
 #include "xfa/fde/css/fde_cssstylesheet.h"
 
 #include <memory>
 
@@ skipping 88 matching lines @@
         ASSERT(FALSE);
         break;
     }
   }
   m_RuleArray.RemoveAll();
   m_Selectors.RemoveAll();
   m_StringCache.clear();
   delete m_pAllocator;
   m_pAllocator = nullptr;
 }
-uint32_t CFDE_CSSStyleSheet::AddRef() {
+uint32_t CFDE_CSSStyleSheet::Retain() {
   return ++m_wRefCount;
 }
 uint32_t CFDE_CSSStyleSheet::Release() {
   uint32_t dwRefCount = --m_wRefCount;
   if (dwRefCount == 0) {
     delete this;
   }
   return dwRefCount;
 }
 int32_t CFDE_CSSStyleSheet::CountRules() const {
@@ skipping 374 matching lines @@
       return NULL;
     }
   }
   if (pPersudoFirst == NULL) {
     return pFirst;
   } else {
     pPersudoLast->SetNext(pFirst);
     return pPersudoFirst;
   }
 }