Closes python#25685: Merged fix from 3.5.

Author: vsajip

Lib/logging/handlers.py

@@ -597,6 +597,8 @@ def makePickle(self, record):
         d['msg'] = record.getMessage()
         d['args'] = None
         d['exc_info'] = None
+        # Issue #25685: delete 'message' if present: redundant with 'msg'
+        d.pop('message', None)
         s = pickle.dumps(d, 1)
         slen = struct.pack(">L", len(s))
         return slen + s