Move MediaQuery classes off BlinkGC heap

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

 /*
  * CSS Media Query
  *
  * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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
@@ skipping 59 matching lines @@
       return (id == exp_value.id);
     if (is_value)
       return (value == exp_value.value);
     if (is_ratio)
       return (numerator == exp_value.numerator &&
               denominator == exp_value.denominator);
     return !exp_value.IsValid();
   }
 };
 
-class CORE_EXPORT MediaQueryExp
-    : public GarbageCollectedFinalized<MediaQueryExp> {
+class CORE_EXPORT MediaQueryExp {
+  DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
+
  public:
-  static MediaQueryExp* CreateIfValid(const String& media_feature,
-                                      const Vector<CSSParserToken, 4>&);
+  // Returns an invalid MediaQueryExp if the arguments are invalid.
+  static MediaQueryExp Create(const String& media_feature,
+                              const Vector<CSSParserToken, 4>&);
+  static MediaQueryExp Invalid() {
+    return MediaQueryExp(String(), MediaQueryExpValue());
+  }
+
+  MediaQueryExp(const MediaQueryExp& other);
   ~MediaQueryExp();
 
   const String& MediaFeature() const { return media_feature_; }
 
   MediaQueryExpValue ExpValue() const { return exp_value_; }
 
+  bool IsValid() const { return !media_feature_.IsNull(); }
+
   bool operator==(const MediaQueryExp& other) const;
 
   bool IsViewportDependent() const;
 
   bool IsDeviceDependent() const;
 
   String Serialize() const;
 
-  MediaQueryExp* Copy() const { return new MediaQueryExp(*this); }
-
-  MediaQueryExp(const MediaQueryExp& other);
-
-  DEFINE_INLINE_TRACE() {}
-
  private:
   MediaQueryExp(const String&, const MediaQueryExpValue&);
 
   String media_feature_;
   MediaQueryExpValue exp_value_;
 };
 
 }  // namespace blink
 
 #endif