Move MediaQuery classes off BlinkGC heap

third_party/WebKit/Source/core/loader/LinkLoader.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 276 matching lines @@
   if (!media.isEmpty()) {
     MediaValues* mediaValues =
         MediaValues::createDynamicIfFrameExists(document.frame());
     if (viewportDescription) {
       mediaValues->overrideViewportDimensions(
           viewportDescription->maxWidth.getFloatValue(),
           viewportDescription->maxHeight.getFloatValue());
     }
 
     // Preload only if media matches
-    MediaQuerySet* mediaQueries = MediaQuerySet::create(media);
+    RefPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(media);
     MediaQueryEvaluator evaluator(*mediaValues);
-    if (!evaluator.eval(mediaQueries))
+    if (!evaluator.eval(*mediaQueries))
       return nullptr;
   }
   if (caller == LinkCalledFromHeader)
     UseCounter::count(document, UseCounter::LinkHeaderPreload);
   Optional<Resource::Type> resourceType =
       LinkLoader::getResourceTypeFromAsAttribute(as);
   if (resourceType == WTF::nullopt) {
     document.addConsoleMessage(ConsoleMessage::create(
         OtherMessageSource, WarningMessageLevel,
         String("<link rel=preload> must have a valid `as` value")));
@@ skipping 178 matching lines @@
 
 DEFINE_TRACE(LinkLoader) {
   visitor->trace(m_client);
   visitor->trace(m_prerender);
   visitor->trace(m_linkPreloadResourceClient);
   ResourceOwner<Resource, ResourceClient>::trace(visitor);
   PrerenderClient::trace(visitor);
 }
 
 }  // namespace blink