Replace IFX_MemoryAllocator::Release() with delete.

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 "xfa/fde/css/fde_cssdatatable.h"
 #include "xfa/fde/css/fde_csssyntax.h"
@@ skipping 83 matching lines @@
         ((CFDE_CSSFontFaceRule*)pRule)->~CFDE_CSSFontFaceRule();
         break;
       default:
         ASSERT(FALSE);
         break;
     }
   }
   m_RuleArray.RemoveAll();
   m_Selectors.RemoveAll();
   m_StringCache.RemoveAll();
-  if (m_pAllocator) {
-    m_pAllocator->Release();
-    m_pAllocator = NULL;
-  }
+  delete m_pAllocator;
+  m_pAllocator = nullptr;
 }
 uint32_t CFDE_CSSStyleSheet::AddRef() {
   return ++m_wRefCount;
 }
 uint32_t CFDE_CSSStyleSheet::Release() {
   uint32_t dwRefCount = --m_wRefCount;
   if (dwRefCount == 0) {
     delete this;
   }
   return dwRefCount;
@@ skipping 377 matching lines @@
       return NULL;
     }
   }
   if (pPersudoFirst == NULL) {
     return pFirst;
   } else {
     pPersudoLast->SetNext(pFirst);
     return pPersudoFirst;
   }
 }