Fold up the SVGLengthContext::convertValueFrom* helpers

Source/core/svg/SVGLength.cpp

Index: Source/core/svg/SVGLength.cpp
diff --git a/Source/core/svg/SVGLength.cpp b/Source/core/svg/SVGLength.cpp
index 1f599c3b242593dce7b6025ab57fe17b85e64fb2..97d0f53c15f6f2aac800a94d18b8e81e8f86fec0 100644
--- a/Source/core/svg/SVGLength.cpp
+++ b/Source/core/svg/SVGLength.cpp
@@ -166,10 +166,6 @@ float SVGLength::value(const SVGLengthContext& context) const
 
 void SVGLength::setValue(float value, const SVGLengthContext& context)
 {
-    // LengthTypePercentage is represented with 100% = 100.0. Good for accuracy but could eventually be changed.
-    if (m_unitType == LengthTypePercentage)
-        value = value / 100;
-
     m_valueInSpecifiedUnits = context.convertValueFromUserUnits(value, unitMode(), unitType());
 }