Remove 3-args |SVGAnimatedLength::baseValueToString()| impl.

Source/core/svg/SVGTextContentElement.cpp

Index: Source/core/svg/SVGTextContentElement.cpp
diff --git a/Source/core/svg/SVGTextContentElement.cpp b/Source/core/svg/SVGTextContentElement.cpp
index e1cd1cb0be1cc5f2c744e4cb6f2508e549317e0d..5b8cfe34cd84a179dadb17549bbc261e8262918c 100644
--- a/Source/core/svg/SVGTextContentElement.cpp
+++ b/Source/core/svg/SVGTextContentElement.cpp
@@ -68,7 +68,7 @@ public:
 
 private:
     SVGAnimatedTextLength(SVGTextContentElement* contextElement)
-        : SVGAnimatedLength(contextElement, SVGNames::textLengthAttr, SVGLength::create(LengthModeOther))
+        : SVGAnimatedLength(contextElement, SVGNames::textLengthAttr, SVGLength::create(LengthModeOther), ForbidNegativeLengths)
     {
     }
 };
@@ -238,7 +238,7 @@ void SVGTextContentElement::parseAttribute(const QualifiedName& name, const Atom
     else if (name == SVGNames::lengthAdjustAttr) {
         m_lengthAdjust->setBaseValueAsString(value, parseError);
     } else if (name == SVGNames::textLengthAttr) {
-        m_textLength->setBaseValueAsString(value, ForbidNegativeLengths, parseError);
+        m_textLength->setBaseValueAsString(value, parseError);
     } else if (name.matches(XMLNames::spaceAttr)) {
     } else
         ASSERT_NOT_REACHED();