CSSMediaRule and CSSSupportsRule inherit from CSSConditionRule

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

 /* Copyright (C) 2012 Motorola Mobility Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above
  *    copyright notice, this list of conditions and the following disclaimer in
@@ skipping 11 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef CSSSupportsRule_h
 #define CSSSupportsRule_h
 
-#include "core/css/CSSGroupingRule.h"
+#include "core/css/CSSConditionRule.h"
 
 namespace blink {
 
 class StyleRuleSupports;
 
-class CSSSupportsRule final : public CSSGroupingRule {
+class CSSSupportsRule final : public CSSConditionRule {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static CSSSupportsRule* create(StyleRuleSupports* rule,
                                  CSSStyleSheet* sheet) {
     return new CSSSupportsRule(rule, sheet);
   }
 
   ~CSSSupportsRule() override {}
 
   String cssText() const override;
 
-  String conditionText() const;
-
-  DEFINE_INLINE_VIRTUAL_TRACE() { CSSGroupingRule::trace(visitor); }

[foolip, 2016/10/18 10:38:33]

I think this should move into CSSConditionRule instead.

-
  private:
   CSSSupportsRule(StyleRuleSupports*, CSSStyleSheet*);
 
   CSSRule::Type type() const override { return kSupportsRule; }
 };
 
 DEFINE_CSS_RULE_TYPE_CASTS(CSSSupportsRule, kSupportsRule);
 
 }  // namespace blink
 
 #endif  // CSSSupportsRule_h