Split out Attribute from CSSPrimitiveValue

Source/core/css/CSSPrimitiveValue.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 71 matching lines @@
         Degrees,
         Radians,
         Gradians,
         Turns,
         Milliseconds,
         Seconds,
         Hertz,
         Kilohertz,
         CustomIdentifier,
         URI,
-        Attribute,
         RGBColor,
         ViewportWidth,
         ViewportHeight,
         ViewportMin,
         ViewportMax,
         DotsPerPixel,
         DotsPerInch,
         DotsPerCentimeter,
         Fraction,
         Integer,
@@ skipping 48 matching lines @@
 
     static UnitType fromName(const String& unit);
 
     bool isAngle() const
     {
         return type() == UnitType::Degrees
             || type() == UnitType::Radians
             || type() == UnitType::Gradians
             || type() == UnitType::Turns;
     }
-    bool isAttr() const { return type() == UnitType::Attribute; }
     bool isCustomIdent() const { return type() == UnitType::CustomIdentifier; }
     bool isFontRelativeLength() const
     {
         return type() == UnitType::Ems
             || type() == UnitType::Exs
             || type() == UnitType::Rems
             || type() == UnitType::Chs;
     }
     bool isViewportPercentageLength() const { return isViewportPercentageLength(type()); }
     static bool isViewportPercentageLength(UnitType type) { return type >= UnitType::ViewportWidth && type <= UnitType::ViewportMax; }
@@ skipping 156 matching lines @@
 };
 
 typedef CSSPrimitiveValue::CSSLengthArray CSSLengthArray;
 typedef CSSPrimitiveValue::CSSLengthTypeArray CSSLengthTypeArray;
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSPrimitiveValue, isPrimitiveValue());
 
 } // namespace blink
 
 #endif // CSSPrimitiveValue_h