Oilpan: Remove OffHeapCollectionTrait

Source/web/TextFinder.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 770 matching lines @@
         ownerFrame().increaseMatchCount(0, identifier);
 }
 
 int TextFinder::ordinalOfFirstMatch() const
 {
     return ordinalOfFirstMatchForFrame(m_ownerFrame.get());
 }
 
 DEFINE_TRACE(TextFinder)
 {
+#if ENABLE(OILPAN)
     visitor->trace(m_ownerFrame);
     visitor->trace(m_currentActiveMatchFrame);
     visitor->trace(m_activeMatch);
     visitor->trace(m_resumeScopingFromRange);
     visitor->trace(m_deferredScopingWork);
     visitor->trace(m_findMatchesCache);
+#endif
 }
 
 } // namespace blink