[svg2] Make SVGLength wrap a CSSPrimitiveValue

Source/core/svg/SVGAnimatedLength.cpp

 /*
  * Copyright (C) 2014 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
 }
 
 void SVGAnimatedLength::setBaseValueAsString(const String& value, SVGParsingError& parseError)
 {
     TrackExceptionState es;
 
     baseValue()->setValueAsString(value, es);
 
     if (es.hadException()) {
         parseError = ParsingAttributeFailedError;
-        baseValue()->newValueSpecifiedUnits(LengthTypeNumber, 0);
+        baseValue()->newValueSpecifiedUnits(CSSPrimitiveValue::CSS_NUMBER, 0);
     } else if (m_negativeValuesMode == ForbidNegativeLengths && baseValue()->valueInSpecifiedUnits() < 0) {
         parseError = NegativeValueForbiddenError;
     }
 }
 
 }