Move MediaQuery classes off BlinkGC heap

third_party/WebKit/Source/core/dom/StyleElement.cpp

 /*
  * Copyright (C) 2006, 2007 Rob Buis
  * Copyright (C) 2008 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 132 matching lines @@
                             element.fastGetAttribute(HTMLNames::nonceAttr),
                             m_startPosition.m_line, text);
 
   // Clearing the current sheet may remove the cache entry so create the new
   // sheet first
   CSSStyleSheet* newSheet = nullptr;
 
   // If type is empty or CSS, this is a CSS style sheet.
   const AtomicString& type = this->type();
   if (isCSS(element, type) && passesContentSecurityPolicyChecks) {
-    MediaQuerySet* mediaQueries = MediaQuerySet::create(media());
+    RefPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(media());
 
     MediaQueryEvaluator screenEval("screen");
     MediaQueryEvaluator printEval("print");
-    if (screenEval.eval(mediaQueries) || printEval.eval(mediaQueries)) {
+    if (screenEval.eval(*mediaQueries) || printEval.eval(*mediaQueries)) {
       m_loading = true;
       TextPosition startPosition =
           m_startPosition == TextPosition::belowRangePosition()
               ? TextPosition::minimumPosition()
               : m_startPosition;
       newSheet = document.styleEngine().createSheet(
           element, text, startPosition, m_styleEngineContext);
       newSheet->setMediaQueries(mediaQueries);
       m_loading = false;
     }
@@ skipping 27 matching lines @@
 
 void StyleElement::startLoadingDynamicSheet(Document& document) {
   document.styleEngine().addPendingSheet(m_styleEngineContext);
 }
 
 DEFINE_TRACE(StyleElement) {
   visitor->trace(m_sheet);
 }
 
 }  // namespace blink