Allocate CSSGlobalRuleSet on heap.

third_party/WebKit/Source/core/css/CSSGlobalRuleSet.h

 // 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.
 
 #ifndef CSSGlobalRuleSet_h
 #define CSSGlobalRuleSet_h
 
 #include "core/css/RuleFeature.h"
 
 namespace blink {
 
 class Document;
 class RuleSet;
 
 // A per Document collection of CSS metadata used for style matching and
 // invalidation. The data is aggregated from author rulesets from all TreeScopes
 // in the whole Document as well as UA stylesheets and watched selectors which
 // apply to elements in all TreeScopes.
 //
 // TODO(rune@opera.com): We would like to move as much of this data as possible
 // to the ScopedStyleResolver as possible to avoid full reconstruction of these
 // rulesets on shadow tree changes. See https://crbug.com/401359
 
-class CSSGlobalRuleSet {
-  DISALLOW_NEW();
+class CSSGlobalRuleSet : public GarbageCollectedFinalized<CSSGlobalRuleSet> {
   WTF_MAKE_NONCOPYABLE(CSSGlobalRuleSet);
 
  public:
-  CSSGlobalRuleSet() {}
+  static CSSGlobalRuleSet* Create() { return new CSSGlobalRuleSet(); }
 
   void Dispose();
   void InitWatchedSelectorsRuleSet(Document&);
   void MarkDirty() { is_dirty_ = true; }
   bool IsDirty() const { return is_dirty_; }
   void Update(Document&);
 
   const RuleFeatureSet& GetRuleFeatureSet() const {
     CHECK(features_.IsAlive());
     return features_;
   }
   RuleSet* SiblingRuleSet() const { return sibling_rule_set_; }
   RuleSet* UncommonAttributeRuleSet() const {
     return uncommon_attribute_rule_set_;
   }
   RuleSet* WatchedSelectorsRuleSet() const {
     return watched_selectors_rule_set_;
   }
   bool HasFullscreenUAStyle() const { return has_fullscreen_ua_style_; }
 
   DECLARE_TRACE();
 
  private:
+  CSSGlobalRuleSet() {}
   // Constructed from rules in all TreeScopes including UA style and style
   // injected from extensions.
   RuleFeatureSet features_;
   Member<RuleSet> sibling_rule_set_;
   Member<RuleSet> uncommon_attribute_rule_set_;
 
   // Rules injected from extensions.
   Member<RuleSet> watched_selectors_rule_set_;
 
   bool has_fullscreen_ua_style_ = false;
   bool is_dirty_ = true;
 };
 
 }  // namespace blink
 
 #endif  // CSSGlobalRuleSet_h