third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/src/google/protobuf/map_lite_unittest.proto

 // 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:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
@@ skipping 63 matching lines @@
   map<int32   , double  > map_int32_double      = 12;
   map<bool    , bool    > map_bool_bool         = 13;
   map<string  , string  > map_string_string     = 14;
   map<int32   , bytes   > map_int32_bytes       = 15;
   map<int32   , MapEnumLite> map_int32_enum     = 16;
   map<int32   , ForeignMessageArenaLite> map_int32_foreign_message = 17;
   map<int32, .protobuf_unittest_no_arena.ForeignMessageLite>
       map_int32_foreign_message_no_arena = 18;
 }
 
-// Test embeded message with required fields
+// Test embedded message with required fields
 message TestRequiredMessageMapLite {
   map<int32, TestRequiredLite> map_field = 1;
 }
 
 message TestEnumMapLite {
   map<int32, Proto2MapEnumLite> known_map_field = 101;
   map<int32, Proto2MapEnumLite> unknown_map_field = 102;
 }
 
 message TestEnumMapPlusExtraLite {
@@ skipping 26 matching lines @@
 
 message TestRequiredLite {
   required int32 a = 1;
   required int32 b = 2;
   required int32 c = 3;
 }
 
 message ForeignMessageArenaLite {
   optional int32 c = 1;
 }