Python 3 compatibility

pylib/gyp/xml_fix.py

 # Copyright (c) 2011 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Applies a fix to CR LF TAB handling in xml.dom.
 
 Fixes this: http://code.google.com/p/chromium/issues/detail?id=76293
 Working around this: http://bugs.python.org/issue5752
 TODO(bradnelson): Consider dropping this when we drop XP support.
 """
@@ skipping 14 matching lines @@
   writer.write(data)
 
 
 def _Replacement_writexml(self, writer, indent="", addindent="", newl=""):
   # indent = current indentation
   # addindent = indentation to add to higher levels
   # newl = newline string
   writer.write(indent+"<" + self.tagName)
 
   attrs = self._get_attributes()
-  a_names = attrs.keys()
-  a_names.sort()
+  a_names = sorted(attrs.keys())
 
   for a_name in a_names:
     writer.write(" %s=\"" % a_name)
     _Replacement_write_data(writer, attrs[a_name].value, is_attrib=True)
     writer.write("\"")
   if self.childNodes:
     writer.write(">%s" % newl)
     for node in self.childNodes:
       node.writexml(writer, indent + addindent, addindent, newl)
     writer.write("%s</%s>%s" % (indent, self.tagName, newl))
@@ skipping 13 matching lines @@
     xml.dom.minidom.Element.writexml = _Replacement_writexml
 
   def Cleanup(self):
     if self.write_data:
       xml.dom.minidom._write_data = self.write_data
       xml.dom.minidom.Element.writexml = self.writexml
       self.write_data = None
 
   def __del__(self):
     self.Cleanup()