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 134 matching lines @@
                             element.FastGetAttribute(HTMLNames::nonceAttr),
                             start_position_.line_, text);
 
   // Clearing the current sheet may remove the cache entry so create the new
   // sheet first
   CSSStyleSheet* new_sheet = nullptr;
 
   // If type is empty or CSS, this is a CSS style sheet.
   const AtomicString& type = this->type();
   if (IsCSS(element, type) && passes_content_security_policy_checks) {
-    MediaQuerySet* media_queries = MediaQuerySet::Create(media());
+    RefPtr<MediaQuerySet> media_queries = MediaQuerySet::Create(media());
 
     MediaQueryEvaluator screen_eval("screen");
     MediaQueryEvaluator print_eval("print");
-    if (screen_eval.Eval(media_queries) || print_eval.Eval(media_queries)) {
+    if (screen_eval.Eval(*media_queries) || print_eval.Eval(*media_queries)) {
       loading_ = true;
       TextPosition start_position =
           start_position_ == TextPosition::BelowRangePosition()
               ? TextPosition::MinimumPosition()
               : start_position_;
       new_sheet = document.GetStyleEngine().CreateSheet(
           element, text, start_position, style_engine_context_);
       new_sheet->SetMediaQueries(media_queries);
       loading_ = false;
     }
@@ skipping 27 matching lines @@
 
 void StyleElement::StartLoadingDynamicSheet(Document& document) {
   document.GetStyleEngine().AddPendingSheet(style_engine_context_);
 }
 
 DEFINE_TRACE(StyleElement) {
   visitor->Trace(sheet_);
 }
 
 }  // namespace blink