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 283 matching lines @@
   if (!media.IsEmpty()) {
     MediaValues* media_values =
         MediaValues::CreateDynamicIfFrameExists(document.GetFrame());
     if (viewport_description) {
       media_values->OverrideViewportDimensions(
           viewport_description->max_width.GetFloatValue(),
           viewport_description->max_height.GetFloatValue());
     }
 
     // Preload only if media matches
-    MediaQuerySet* media_queries = MediaQuerySet::Create(media);
+    RefPtr<MediaQuerySet> media_queries = MediaQuerySet::Create(media);
     MediaQueryEvaluator evaluator(*media_values);
-    if (!evaluator.Eval(media_queries))
+    if (!evaluator.Eval(*media_queries))
       return nullptr;
   }
   if (caller == kLinkCalledFromHeader)
     UseCounter::Count(document, UseCounter::kLinkHeaderPreload);
   Optional<Resource::Type> resource_type =
       LinkLoader::GetResourceTypeFromAsAttribute(as);
   if (resource_type == WTF::kNullopt) {
     document.AddConsoleMessage(ConsoleMessage::Create(
         kOtherMessageSource, kWarningMessageLevel,
         String("<link rel=preload> must have a valid `as` value")));
@@ skipping 181 matching lines @@
 
 DEFINE_TRACE(LinkLoader) {
   visitor->Trace(client_);
   visitor->Trace(prerender_);
   visitor->Trace(link_preload_resource_client_);
   ResourceOwner<Resource, ResourceClient>::Trace(visitor);
   PrerenderClient::Trace(visitor);
 }
 
 }  // namespace blink