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

Source/bindings/scripts/v8_attributes.py

Index: Source/bindings/scripts/v8_attributes.py
diff --git a/Source/bindings/scripts/v8_attributes.py b/Source/bindings/scripts/v8_attributes.py
index 8f73ee8acecfe5604e14a1af0d9a97816fa4f124..35de04980047591f52d4dd395de27f4c809c2a9b 100644
--- a/Source/bindings/scripts/v8_attributes.py
+++ b/Source/bindings/scripts/v8_attributes.py
@@ -425,13 +425,7 @@ def setter_base_name(interface, attribute, arguments):
 def scoped_content_attribute_name(interface, attribute):
     content_attribute_name = attribute.extended_attributes['Reflect'] or attribute.name.lower()
     if interface.name.startswith('SVG'):
-        # SVG's xmlbase/xmlspace/xmllang need special behavior, i.e.
-        # it is in XMLNames namespace and the generated attribute has no xml prefix.
-        if attribute.name.startswith('xml'):
-            namespace = 'XMLNames'
-            content_attribute_name = content_attribute_name[3:]
-        else:
-            namespace = 'SVGNames'
+        namespace = 'SVGNames'
     else:
         namespace = 'HTMLNames'
     includes.add('core/%s.h' % namespace)