Bump vendoring, move to proto3 release.

recipe_engine/third_party/google/protobuf/internal/message_test.py

 #! /usr/bin/env python
 #
 # Protocol Buffers - Google's data interchange format
 # Copyright 2008 Google Inc.  All rights reserved.
 # https://developers.google.com/protocol-buffers/
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
@@ skipping 1417 matching lines @@
     msg.map_int32_int32[12] = 34
     msg.map_int32_int32[56] = 78
     msg.map_int64_int64[22] = 33
     msg.map_int32_foreign_message[111].c = 5
     msg.map_int32_foreign_message[222].c = 10
 
     msg2 = map_unittest_pb2.TestMap()
     msg2.map_int32_int32[12] = 55
     msg2.map_int64_int64[88] = 99
     msg2.map_int32_foreign_message[222].c = 15
+    msg2.map_int32_foreign_message[222].d = 20
+    old_map_value = msg2.map_int32_foreign_message[222]
 
     msg2.MergeFrom(msg)
 
     self.assertEqual(34, msg2.map_int32_int32[12])
     self.assertEqual(78, msg2.map_int32_int32[56])
     self.assertEqual(33, msg2.map_int64_int64[22])
     self.assertEqual(99, msg2.map_int64_int64[88])
     self.assertEqual(5, msg2.map_int32_foreign_message[111].c)
     self.assertEqual(10, msg2.map_int32_foreign_message[222].c)
+    self.assertFalse(msg2.map_int32_foreign_message[222].HasField('d'))
+    self.assertEqual(15, old_map_value.c)
 
     # Verify that there is only one entry per key, even though the MergeFrom
     # may have internally created multiple entries for a single key in the
     # list representation.
     as_dict = {}
     for key in msg2.map_int32_foreign_message:
       self.assertFalse(key in as_dict)
       as_dict[key] = msg2.map_int32_foreign_message[key].c
 
     self.assertEqual({111: 5, 222: 10}, as_dict)
@@ skipping 386 matching lines @@
 
   def testSucceedOversizeProto(self):
     from google.protobuf.pyext._message import SetAllowOversizeProtos
     SetAllowOversizeProtos(True)
     q = self.proto_cls()
     q.ParseFromString(self.p_serialized)
     self.assertEqual(self.p.field.payload, q.field.payload)
 
 if __name__ == '__main__':
   unittest.main()