Rename IFX_Unknown to IFX_Retainable.

xfa/fde/css/fde_csscache.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_csscache.h"
 
 #include <algorithm>
 
 #include "core/fxcrt/include/fx_ext.h"
 #include "xfa/fxfa/app/xfa_textlayout.h"
 
 FDE_CSSCacheItem::FDE_CSSCacheItem(IFDE_CSSStyleSheet* p)
     : pStylesheet(p), dwActivity(0) {
-  ASSERT(pStylesheet);
-  pStylesheet->AddRef();
+  pStylesheet->Retain();
 }
 
 FDE_CSSCacheItem::~FDE_CSSCacheItem() {
   pStylesheet->Release();
 }
 
 FDE_CSSTagCache::FDE_CSSTagCache(FDE_CSSTagCache* parent,
                                  CXFA_CSSTagProvider* tag)
     : pTag(tag),
       pParent(parent),
@@ skipping 33 matching lines @@
   FDE_CSSTagCache* pTop = GetTopElement();
   FDE_CSSTagCache item(pTop, pTag);
   m_Stack.Push(item);
 }
 
 void CFDE_CSSAccelerator::OnLeaveTag(CXFA_CSSTagProvider* pTag) {
   ASSERT(m_Stack.GetTopElement());
   ASSERT(m_Stack.GetTopElement()->GetTag() == pTag);
   m_Stack.Pop();
 }