Move MediaQuery classes off BlinkGC heap

third_party/WebKit/Source/core/html/LinkStyle.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/html/LinkStyle.h"
 
 #include "core/css/StyleSheetContents.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/LocalFrameClient.h"
 #include "core/frame/SubresourceIntegrity.h"
@@ skipping 295 matching lines @@
 
   String title = m_owner->title();
   if (!title.isEmpty() && !m_owner->isAlternate() &&
       m_disabledState != EnabledViaScript && m_owner->isInDocumentTree()) {
     document().styleEngine().setPreferredStylesheetSetNameIfNotSet(title);
   }
 
   bool mediaQueryMatches = true;
   LocalFrame* frame = loadingFrame();
   if (!m_owner->media().isEmpty() && frame) {
-    MediaQuerySet* media = MediaQuerySet::create(m_owner->media());
+    RefPtr<MediaQuerySet> media = MediaQuerySet::create(m_owner->media());
     MediaQueryEvaluator evaluator(frame);
-    mediaQueryMatches = evaluator.eval(media);
+    mediaQueryMatches = evaluator.eval(*media);
   }
 
   // Don't hold up layout tree construction and script execution on
   // stylesheets that are not needed for the layout at the moment.
   bool blocking = mediaQueryMatches && !m_owner->isAlternate() &&
                   m_owner->isCreatedByParser();
   addPendingSheet(blocking ? Blocking : NonBlocking);
 
   // Load stylesheets that are not needed for the layout immediately with low
   // priority.  When the link element is created by scripts, load the
@@ skipping 86 matching lines @@
     removePendingSheet();
 }
 
 DEFINE_TRACE(LinkStyle) {
   visitor->trace(m_sheet);
   LinkResource::trace(visitor);
   ResourceOwner<StyleSheetResource>::trace(visitor);
 }
 
 }  // namespace blink