Remove SVGElement.xmlbase/xmlspace/xmllang and no use codes.

Source/core/svg/SVGElement.idl

Index: Source/core/svg/SVGElement.idl
diff --git a/Source/core/svg/SVGElement.idl b/Source/core/svg/SVGElement.idl
index 5fce604e74e686aaf8ee3706834f19b2f4d91df1..36381d6b7d9419169e4b3abf5746850f95c87704 100644
--- a/Source/core/svg/SVGElement.idl
+++ b/Source/core/svg/SVGElement.idl
@@ -21,13 +21,9 @@
  */
 
 interface SVGElement : Element {
-    [Reflect, MeasureAs=SVGElementXmlbase] attribute DOMString xmlbase;
     readonly attribute SVGSVGElement? ownerSVGElement;
     readonly attribute SVGElement? viewportElement;
 
-    [Reflect, MeasureAs=SVGElementXmllang] attribute DOMString xmllang;
-    [Reflect, MeasureAs=SVGElementXmlspace] attribute DOMString xmlspace;
-
     [RuntimeEnabled=SVG1DOM, MeasureAs=SVGClassName] readonly attribute SVGAnimatedString className;
 
     readonly attribute CSSStyleDeclaration style;