Move MediaQuery classes off BlinkGC heap

third_party/WebKit/Source/core/css/MediaQuerySetTest.cpp

 // Copyright 2014 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/css/MediaQuery.h"
 
 #include "core/css/MediaList.h"
 #include "platform/wtf/text/StringBuilder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 164 matching lines @@
       {"only not", "not all"},
       {"only and", "not all"},
       {"only only", "not all"},
       {"only or", "not all"},
       {"not (orientation)", "not all"},
       {"only (orientation)", "not all"},
       {nullptr, nullptr}  // Do not remove the terminator line.
   };
 
   for (unsigned i = 0; test_cases[i].input; ++i) {
-    MediaQuerySet* query_set = MediaQuerySet::Create(test_cases[i].input);
+    RefPtr<MediaQuerySet> query_set =
+        MediaQuerySet::Create(test_cases[i].input);
     TestMediaQuery(test_cases[i], *query_set);
   }
 }
 
 }  // namespace blink