Remove a use of list.sort(cmp=) to silence a -3 DeprecationWarning in
cookielib.
diff --git a/Lib/cookielib.py b/Lib/cookielib.py
index b27f63c..9439b5c 100644
--- a/Lib/cookielib.py
+++ b/Lib/cookielib.py
@@ -1258,8 +1258,7 @@
 
         """
         # add cookies in order of most specific (ie. longest) path first
-        def decreasing_size(a, b): return cmp(len(b.path), len(a.path))
-        cookies.sort(decreasing_size)
+        cookies.sort(key=lambda arg: len(arg.path), reverse=True)
 
         version_set = False