Do not keep InvalidationSets on the Oilpan heap.

third_party/WebKit/Source/core/css/invalidation/InvalidationSet.cpp

 /*
  * Copyright (C) 2014 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 123 matching lines @@
         for (const auto& tagName : *other.m_tagNames)
             addTagName(tagName);
     }
 
     if (other.m_attributes) {
         for (const auto& attribute : *other.m_attributes)
             addAttribute(attribute);
     }
 }
 
-WillBeHeapHashSet<AtomicString>& InvalidationSet::ensureClassSet()
+HashSet<AtomicString>& InvalidationSet::ensureClassSet()
 {
     if (!m_classes)
-        m_classes = adoptPtrWillBeNoop(new WillBeHeapHashSet<AtomicString>);
+        m_classes = adoptPtr(new HashSet<AtomicString>);
     return *m_classes;
 }
 
-WillBeHeapHashSet<AtomicString>& InvalidationSet::ensureIdSet()
+HashSet<AtomicString>& InvalidationSet::ensureIdSet()
 {
     if (!m_ids)
-        m_ids = adoptPtrWillBeNoop(new WillBeHeapHashSet<AtomicString>);
+        m_ids = adoptPtr(new HashSet<AtomicString>);
     return *m_ids;
 }
 
-WillBeHeapHashSet<AtomicString>& InvalidationSet::ensureTagNameSet()
+HashSet<AtomicString>& InvalidationSet::ensureTagNameSet()
 {
     if (!m_tagNames)
-        m_tagNames = adoptPtrWillBeNoop(new WillBeHeapHashSet<AtomicString>);
+        m_tagNames = adoptPtr(new HashSet<AtomicString>);
     return *m_tagNames;
 }
 
-WillBeHeapHashSet<AtomicString>& InvalidationSet::ensureAttributeSet()
+HashSet<AtomicString>& InvalidationSet::ensureAttributeSet()
 {
     if (!m_attributes)
-        m_attributes = adoptPtrWillBeNoop(new WillBeHeapHashSet<AtomicString>);
+        m_attributes = adoptPtr(new HashSet<AtomicString>);
     return *m_attributes;
 }
 
 void InvalidationSet::addClass(const AtomicString& className)
 {
     if (wholeSubtreeInvalid())
         return;
     ensureClassSet().add(className);
 }
 
@@ skipping 26 matching lines @@
     m_allDescendantsMightBeInvalid = true;
     m_customPseudoInvalid = false;
     m_treeBoundaryCrossing = false;
     m_insertionPointCrossing = false;
     m_classes = nullptr;
     m_ids = nullptr;
     m_tagNames = nullptr;
     m_attributes = nullptr;
 }
 
-DEFINE_TRACE(InvalidationSet)
-{
-#if ENABLE(OILPAN)
-    visitor->trace(m_classes);
-    visitor->trace(m_ids);
-    visitor->trace(m_tagNames);
-    visitor->trace(m_attributes);
-#endif
-}
-
 void InvalidationSet::toTracedValue(TracedValue* value) const
 {
     value->beginDictionary();
 
     value->setString("id", descendantInvalidationSetToIdString(*this));
 
     if (m_allDescendantsMightBeInvalid)
         value->setBoolean("allDescendantsMightBeInvalid", true);
     if (m_customPseudoInvalid)
         value->setBoolean("customPseudoInvalid", true);
@@ skipping 38 matching lines @@
 {
     RefPtr<TracedValue> value = TracedValue::create();
     value->beginArray("InvalidationSet");
     toTracedValue(value.get());
     value->endArray();
     fprintf(stderr, "%s\n", value->asTraceFormat().ascii().data());
 }
 #endif // NDEBUG
 
 } // namespace blink