Move MediaQuery classes off BlinkGC heap

third_party/WebKit/Source/core/css/StyleRule.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2008, 2012 Apple 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 334 matching lines @@
 StyleRuleCondition::StyleRuleCondition(
     RuleType type,
     const String& conditionText,
     HeapVector<Member<StyleRuleBase>>& adoptRules)
     : StyleRuleGroup(type, adoptRules), m_conditionText(conditionText) {}
 
 StyleRuleCondition::StyleRuleCondition(const StyleRuleCondition& conditionRule)
     : StyleRuleGroup(conditionRule),
       m_conditionText(conditionRule.m_conditionText) {}
 
-StyleRuleMedia::StyleRuleMedia(MediaQuerySet* media,
+StyleRuleMedia::StyleRuleMedia(RefPtr<MediaQuerySet> media,
                                HeapVector<Member<StyleRuleBase>>& adoptRules)
     : StyleRuleCondition(Media, adoptRules), m_mediaQueries(media) {}
 
 StyleRuleMedia::StyleRuleMedia(const StyleRuleMedia& mediaRule)
     : StyleRuleCondition(mediaRule) {
   if (mediaRule.m_mediaQueries)
     m_mediaQueries = mediaRule.m_mediaQueries->copy();
 }
 
 DEFINE_TRACE_AFTER_DISPATCH(StyleRuleMedia) {
-  visitor->trace(m_mediaQueries);
   StyleRuleCondition::traceAfterDispatch(visitor);
 }
 
 StyleRuleSupports::StyleRuleSupports(
     const String& conditionText,
     bool conditionIsSupported,
     HeapVector<Member<StyleRuleBase>>& adoptRules)
     : StyleRuleCondition(Supports, conditionText, adoptRules),
       m_conditionIsSupported(conditionIsSupported) {}
 
@@ skipping 15 matching lines @@
     m_properties = m_properties->mutableCopy();
   return *toMutableStylePropertySet(m_properties);
 }
 
 DEFINE_TRACE_AFTER_DISPATCH(StyleRuleViewport) {
   visitor->trace(m_properties);
   StyleRuleBase::traceAfterDispatch(visitor);
 }
 
 }  // namespace blink