Move most of the [Pass]RefPtr's of CSSPrimitiveValue to our transition types.

Source/core/svg/SVGLength.cpp

 /*
  * Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Apple Inc. All rights reserved.
  *
  * 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 285 matching lines @@
     };
 
     if (svgType == LengthTypeUnknown)
         return SVGLength::create();
 
     RefPtr<SVGLength> length = SVGLength::create();
     length->newValueSpecifiedUnits(svgType, value->getFloatValue());
     return length.release();
 }
 
-PassRefPtr<CSSPrimitiveValue> SVGLength::toCSSPrimitiveValue(PassRefPtr<SVGLength> passLength)
+PassRefPtrWillBeRawPtr<CSSPrimitiveValue> SVGLength::toCSSPrimitiveValue(PassRefPtr<SVGLength> passLength)
 {
     RefPtr<SVGLength> length = passLength;
 
     CSSPrimitiveValue::UnitTypes cssType = CSSPrimitiveValue::CSS_UNKNOWN;
     switch (length->unitType()) {
     case LengthTypeUnknown:
         break;
     case LengthTypeNumber:
         cssType = CSSPrimitiveValue::CSS_NUMBER;
         break;
@@ skipping 141 matching lines @@
 
 float SVGLength::calculateDistance(PassRefPtr<NewSVGPropertyBase> toValue, SVGElement* contextElement)
 {
     SVGLengthContext lengthContext(contextElement);
     RefPtr<SVGLength> toLength = toSVGLength(toValue);
 
     return fabsf(toLength->value(lengthContext, IGNORE_EXCEPTION) - value(lengthContext, IGNORE_EXCEPTION));
 }
 
 }