Cleanup resolving of 'em' units in SVGLengthContext

Source/core/svg/SVGLengthContext.h

Index: Source/core/svg/SVGLengthContext.h
diff --git a/Source/core/svg/SVGLengthContext.h b/Source/core/svg/SVGLengthContext.h
index 3e2ba449e39ff51955464b4e114178830188c6b6..81c32d33f686234abd208f101ba632abeeb7c493 100644
--- a/Source/core/svg/SVGLengthContext.h
+++ b/Source/core/svg/SVGLengthContext.h
@@ -80,15 +80,9 @@ private:
     float valueForLength(const Length&, float zoom, SVGLengthMode) const;
     static float valueForLength(const Length&, float zoom, float dimension);
 
-    float convertValueFromUserUnitsToEMS(float value) const;
-    float convertValueFromEMSToUserUnits(float value) const;
-
     float convertValueFromUserUnitsToEXS(float value) const;
     float convertValueFromEXSToUserUnits(float value) const;
 
-    float convertValueFromUserUnitsToREMS(float value) const;
-    float convertValueFromREMSToUserUnits(float value) const;
-
     RawPtrWillBeMember<const SVGElement> m_context;
 };