Oilpan: Remove OffHeapCollectionTrait

Source/core/css/resolver/MatchedPropertiesCache.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 28 matching lines @@
 class CachedMatchedProperties final : public NoBaseWillBeGarbageCollectedFinalized<CachedMatchedProperties> {
 
 public:
     WillBeHeapVector<MatchedProperties> matchedProperties;
     MatchRanges ranges;
     RefPtr<ComputedStyle> computedStyle;
     RefPtr<ComputedStyle> parentComputedStyle;
 
     void set(const ComputedStyle&, const ComputedStyle& parentStyle, const MatchResult&);
     void clear();
-    DEFINE_INLINE_TRACE() { visitor->trace(matchedProperties); }
+    DEFINE_INLINE_TRACE()
+    {
+#if ENABLE(OILPAN)
+        visitor->trace(matchedProperties);
+#endif
+    }
 };
 
 // Specialize the HashTraits for CachedMatchedProperties to check for dead
 // entries in the MatchedPropertiesCache.
 #if ENABLE(OILPAN)
 struct CachedMatchedPropertiesHashTraits : HashTraits<Member<CachedMatchedProperties>> {
     static const WTF::WeakHandlingFlag weakHandlingFlag = WTF::WeakHandlingInCollections;
 
     template<typename VisitorDispatcher>
     static bool traceInCollection(VisitorDispatcher visitor, Member<CachedMatchedProperties>& cachedProperties, WTF::ShouldWeakPointersBeMarkedStrongly strongify)
@@ skipping 53 matching lines @@
 
     typedef HashMap<unsigned, OwnPtr<CachedMatchedProperties>> Cache;
     Timer<MatchedPropertiesCache> m_sweepTimer;
 #endif
     Cache m_cache;
 };
 
 }
 
 #endif