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

Source/core/svg/SVGAnimatedLength.cpp

Index: Source/core/svg/SVGAnimatedLength.cpp
diff --git a/Source/core/svg/SVGAnimatedLength.cpp b/Source/core/svg/SVGAnimatedLength.cpp
index bc447b07280ebfb8d410374e1bd403a14d4851cc..097c96decd7e9d5e4c4ec4a0d10c624207cb863f 100644
--- a/Source/core/svg/SVGAnimatedLength.cpp
+++ b/Source/core/svg/SVGAnimatedLength.cpp
@@ -39,7 +39,7 @@ void SVGAnimatedLength::setDefaultValueAsString(const String& value)
     baseValue()->setValueAsString(value, ASSERT_NO_EXCEPTION);
 }
 
-void SVGAnimatedLength::setBaseValueAsString(const String& value, SVGLengthNegativeValuesMode mode, SVGParsingError& parseError)
+void SVGAnimatedLength::setBaseValueAsString(const String& value, SVGParsingError& parseError)
 {
     TrackExceptionState es;
 
@@ -48,7 +48,7 @@ void SVGAnimatedLength::setBaseValueAsString(const String& value, SVGLengthNegat
     if (es.hadException()) {
         parseError = ParsingAttributeFailedError;
         baseValue()->newValueSpecifiedUnits(LengthTypeNumber, 0);
-    } else if (mode == ForbidNegativeLengths && baseValue()->valueInSpecifiedUnits() < 0) {
+    } else if (m_negativeValuesMode == ForbidNegativeLengths && baseValue()->valueInSpecifiedUnits() < 0) {
         parseError = NegativeValueForbiddenError;
     }
 }