Move MediaQuery classes off BlinkGC heap

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

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2008, 2009, 2010, 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 14 matching lines @@
 #include "core/css/StyleSheetContents.h"
 #include "core/dom/Document.h"
 #include "core/loader/resource/CSSStyleSheetResource.h"
 #include "platform/loader/fetch/FetchInitiatorTypeNames.h"
 #include "platform/loader/fetch/FetchRequest.h"
 #include "platform/loader/fetch/ResourceFetcher.h"
 
 namespace blink {
 
 StyleRuleImport* StyleRuleImport::create(const String& href,
-                                         MediaQuerySet* media) {
+                                         RefPtr<MediaQuerySet> media) {
   return new StyleRuleImport(href, media);
 }
 
-StyleRuleImport::StyleRuleImport(const String& href, MediaQuerySet* media)
+StyleRuleImport::StyleRuleImport(const String& href,
+                                 RefPtr<MediaQuerySet> media)
     : StyleRuleBase(Import),
       m_parentStyleSheet(nullptr),
       m_styleSheetClient(new ImportedStyleSheetClient(this)),
       m_strHref(href),
       m_mediaQueries(media),
       m_loading(false) {
   if (!m_mediaQueries)
     m_mediaQueries = MediaQuerySet::create(String());
 }
 
 StyleRuleImport::~StyleRuleImport() {}
 
 void StyleRuleImport::dispose() {
   if (m_resource)
     m_resource->removeClient(m_styleSheetClient);
   m_resource = nullptr;
 }
 
 DEFINE_TRACE_AFTER_DISPATCH(StyleRuleImport) {
   visitor->trace(m_styleSheetClient);
   visitor->trace(m_parentStyleSheet);
-  visitor->trace(m_mediaQueries);
   visitor->trace(m_styleSheet);
   visitor->trace(m_resource);
   StyleRuleBase::traceAfterDispatch(visitor);
 }
 
 void StyleRuleImport::setCSSStyleSheet(
     const String& href,
     const KURL& baseURL,
     const String& charset,
     const CSSStyleSheetResource* cachedStyleSheet) {
@@ skipping 72 matching lines @@
     // the sheet being imported is pending.
     if (m_parentStyleSheet && m_parentStyleSheet->loadCompleted() &&
         rootSheet == m_parentStyleSheet)
       m_parentStyleSheet->startLoadingDynamicSheet();
     m_loading = true;
     m_resource->addClient(m_styleSheetClient);
   }
 }
 
 }  // namespace blink