Move MediaQuery classes off BlinkGC heap

third_party/WebKit/Source/core/css/ActiveStyleSheetsTest.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/css/ActiveStyleSheets.h"
 
 #include "bindings/core/v8/V8Binding.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/MediaQueryEvaluator.h"
 #include "core/css/StyleSheetContents.h"
@@ skipping 403 matching lines @@
   ActiveStyleSheetVector old_sheets;
   ActiveStyleSheetVector new_sheets;
   HeapHashSet<Member<RuleSet>> changed_rule_sets;
 
   EXPECT_EQ(
       kNoActiveSheetsChanged,
       CompareActiveStyleSheets(old_sheets, new_sheets, changed_rule_sets));
   EXPECT_EQ(0u, changed_rule_sets.size());
 
   CSSStyleSheet* sheet1 = CreateSheet();
-  MediaQuerySet* mq =
+  RefPtr<MediaQuerySet> mq =
       MediaQueryParser::ParseMediaQuerySet("(min-width: 9000px)");
   sheet1->SetMediaQueries(mq);
   sheet1->MatchesMediaQueries(MediaQueryEvaluator());
 
   new_sheets.push_back(std::make_pair(sheet1, nullptr));
 
   EXPECT_EQ(
       kActiveSheetsAppended,
       CompareActiveStyleSheets(old_sheets, new_sheets, changed_rule_sets));
   EXPECT_EQ(0u, changed_rule_sets.size());
@@ skipping 136 matching lines @@
   ActiveStyleSheetVector old_style_sheets;
   old_style_sheets.push_back(
       std::make_pair(css_sheet, &css_sheet->Contents()->GetRuleSet()));
   GetStyleEngine().ApplyRuleSetChanges(shadow_root, old_style_sheets,
                                        ActiveStyleSheetVector());
 
   EXPECT_TRUE(GetStyleEngine().TreeBoundaryCrossingScopes().IsEmpty());
 }
 
 }  // namespace blink