[SVG] SVGLength{,List} migration to new SVG property impl.

Source/core/rendering/svg/SVGTextLayoutEngineBaseline.cpp

Index: Source/core/rendering/svg/SVGTextLayoutEngineBaseline.cpp
diff --git a/Source/core/rendering/svg/SVGTextLayoutEngineBaseline.cpp b/Source/core/rendering/svg/SVGTextLayoutEngineBaseline.cpp
index 3825b4b1220fe9eebd40fa21a6a8c158b5cdac5e..502c397993df7a5cb4fcc6f2206b1dd57087f867 100644
--- a/Source/core/rendering/svg/SVGTextLayoutEngineBaseline.cpp
+++ b/Source/core/rendering/svg/SVGTextLayoutEngineBaseline.cpp
@@ -38,12 +38,12 @@ SVGTextLayoutEngineBaseline::SVGTextLayoutEngineBaseline(const Font& font)
 float SVGTextLayoutEngineBaseline::calculateBaselineShift(const SVGRenderStyle* style, SVGElement* contextElement) const
 {
     if (style->baselineShift() == BS_LENGTH) {
-        SVGLength baselineShiftValueLength = style->baselineShiftValue();
-        if (baselineShiftValueLength.unitType() == LengthTypePercentage)
-            return baselineShiftValueLength.valueAsPercentage() * m_font.pixelSize();
+        RefPtr<SVGLength> baselineShiftValueLength = style->baselineShiftValue();
+        if (baselineShiftValueLength->unitType() == LengthTypePercentage)
+            return baselineShiftValueLength->valueAsPercentage() * m_font.pixelSize();
 
         SVGLengthContext lengthContext(contextElement);
-        return baselineShiftValueLength.value(lengthContext);
+        return baselineShiftValueLength->value(lengthContext);
     }
 
     switch (style->baselineShift()) {