Oilpan: Remove OffHeapCollectionTrait

Source/core/html/parser/HTMLFormattingElementList.h

 /*
  * Copyright (C) 2010 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 107 matching lines @@
     Bookmark bookmarkFor(Element*);
     void swapTo(Element* oldElement, PassRefPtrWillBeRawPtr<HTMLStackItem> newItem, const Bookmark&);
 
     void appendMarker();
     // clearToLastMarker also clears the marker (per the HTML5 spec).
     void clearToLastMarker();
 
     const Entry& at(size_t i) const { return m_entries[i]; }
     Entry& at(size_t i) { return m_entries[i]; }
 
-    DEFINE_INLINE_TRACE() { visitor->trace(m_entries); }
+    DEFINE_INLINE_TRACE()
+    {
+#if ENABLE(OILPAN)
+        visitor->trace(m_entries);
+#endif
+    }
 
 #ifndef NDEBUG
     void show();
 #endif
 
 private:
     Entry* first() { return &at(0); }
 
     // http://www.whatwg.org/specs/web-apps/current-work/multipage/parsing.html#list-of-active-formatting-elements
     // These functions enforce the "Noah's Ark" condition, which removes redundant mis-nested elements.
     void tryToEnsureNoahsArkConditionQuickly(HTMLStackItem*, WillBeHeapVector<RawPtrWillBeMember<HTMLStackItem>>& remainingCandiates);
     void ensureNoahsArkCondition(HTMLStackItem*);
 
     WillBeHeapVector<Entry> m_entries;
 };
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::HTMLFormattingElementList::Entry);
 
 #endif // HTMLFormattingElementList_h