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

Source/bindings/scripts/v8_attributes.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 407 matching lines @@
 
     base_idl_type = attribute.idl_type.base_type
     if base_idl_type in CONTENT_ATTRIBUTE_SETTER_NAMES:
         return CONTENT_ATTRIBUTE_SETTER_NAMES[base_idl_type]
     return 'setAttribute'
 
 
 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)
     return '%s::%sAttr' % (namespace, content_attribute_name)
 
 
 ################################################################################
 # Attribute configuration
 ################################################################################
 
@@ skipping 102 matching lines @@
     return attribute.idl_type.name.endswith('Constructor')
 
 
 def update_constructor_attribute_context(interface, attribute, context):
     context['needs_constructor_getter_callback'] = context['measure_as'] or context['deprecate_as']
     # When the attribute name is the same as the interface name, do not generate
     # callback functions for each attribute and use
     # {{cpp_class}}ConstructorAttributeSetterCallback.  Otherwise, generate
     # a callback function in order to hard-code the attribute name.
     context['needs_constructor_setter_callback'] = context['name'] != context['constructor_type']