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 287 matching lines @@
 
   String title = owner_->title();
   if (!title.IsEmpty() && !owner_->IsAlternate() &&
       disabled_state_ != kEnabledViaScript && owner_->IsInDocumentTree()) {
     GetDocument().GetStyleEngine().SetPreferredStylesheetSetNameIfNotSet(title);
   }
 
   bool media_query_matches = true;
   LocalFrame* frame = LoadingFrame();
   if (!owner_->Media().IsEmpty() && frame) {
-    MediaQuerySet* media = MediaQuerySet::Create(owner_->Media());
+    RefPtr<MediaQuerySet> media = MediaQuerySet::Create(owner_->Media());
     MediaQueryEvaluator evaluator(frame);
-    media_query_matches = evaluator.Eval(media);
+    media_query_matches = 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 = media_query_matches && !owner_->IsAlternate() &&
                   owner_->IsCreatedByParser();
   AddPendingSheet(blocking ? kBlocking : kNonBlocking);
 
   // Load stylesheets that are not needed for the layout immediately with low
   // priority.  When the link element is created by scripts, load the
@@ skipping 88 matching lines @@
     RemovePendingSheet();
 }
 
 DEFINE_TRACE(LinkStyle) {
   visitor->Trace(sheet_);
   LinkResource::Trace(visitor);
   ResourceOwner<StyleSheetResource>::Trace(visitor);
 }
 
 }  // namespace blink