Migrate remaining tests from UserDict.UserDict to collections.UserDict.
diff --git a/Lib/test/test_cfgparser.py b/Lib/test/test_cfgparser.py
index 8822735..3ef82be 100644
--- a/Lib/test/test_cfgparser.py
+++ b/Lib/test/test_cfgparser.py
@@ -1,11 +1,11 @@
 import ConfigParser
 import io
 import unittest
-import UserDict
+import collections
 
 from test import test_support
 
-class SortedDict(UserDict.UserDict):
+class SortedDict(collections.UserDict):
     def items(self):
         return sorted(self.data.items())