Do not keep InvalidationSets on the Oilpan heap.

third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 141 matching lines @@
     if (view) {
         m_medium = adoptPtr(new MediaQueryEvaluator(&view->frame()));
         m_printMediaType = equalIgnoringCase(view->mediaType(), MediaTypeNames::print);
     } else {
         m_medium = adoptPtr(new MediaQueryEvaluator("all"));
     }
 
     initWatchedSelectorRules();
 }
 
+StyleResolver::~StyleResolver()
+{
+}
+
 void StyleResolver::initWatchedSelectorRules()
 {
     CSSSelectorWatch* watch = CSSSelectorWatch::fromIfExists(*m_document);
     if (!watch)
         return;
     const WillBeHeapVector<RefPtrWillBeMember<StyleRule>>& watchedSelectors = watch->watchedCallbackSelectors();
     if (!watchedSelectors.size())
         return;
     m_watchedSelectorsRules = RuleSet::create();
     for (unsigned i = 0; i < watchedSelectors.size(); ++i)
@@ skipping 167 matching lines @@
 void StyleResolver::pushParentElement(Element& parent)
 {
     m_selectorFilter.pushParent(parent);
 }
 
 void StyleResolver::popParentElement(Element& parent)
 {
     m_selectorFilter.popParent(parent);
 }
 
-StyleResolver::~StyleResolver()
-{
-}
-
 static inline ScopedStyleResolver* scopedResolverFor(const Element* element)
 {
     // Ideally, returning element->treeScope().scopedStyleResolver() should be
     // enough, but ::cue and custom pseudo elements like ::-webkit-meter-bar pierce
     // through a shadow dom boundary, yet they are not part of m_treeBoundaryCrossingRules.
     // The assumption here is that these rules only pierce through one boundary and
     // that the scope of these elements do not have a style resolver due to the fact
     // that VTT scopes and UA shadow trees don't have <style> elements. This is
     // backed up by the ASSERTs below.
     //
@@ skipping 1124 matching lines @@
     visitor->trace(m_watchedSelectorsRules);
     visitor->trace(m_treeBoundaryCrossingRules);
     visitor->trace(m_styleResourceLoader);
     visitor->trace(m_styleSharingLists);
     visitor->trace(m_pendingStyleSheets);
     visitor->trace(m_document);
 #endif
 }
 
 } // namespace blink