Revert "third_party/protobuf: Update to HEAD (83d681ee2c)"

third_party/protobuf/src/google/protobuf/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 177 matching lines @@
 }
 
 message TestDeprecatedFields {
   optional int32 deprecated_int32 = 1 [deprecated=true];
 }
 
 // Define these after TestAllTypes to make sure the compiler can handle
 // that.
 message ForeignMessage {
   optional int32 c = 1;
-  optional int32 d = 2;
 }
 
 enum ForeignEnum {
   FOREIGN_FOO = 4;
   FOREIGN_BAR = 5;
   FOREIGN_BAZ = 6;
 }
 
 message TestReservedFields {
   reserved 2, 15, 9 to 11;
@@ skipping 662 matching lines @@
 
 service TestService {
   rpc Foo(FooRequest) returns (FooResponse);
   rpc Bar(BarRequest) returns (BarResponse);
 }
 
 
 message BarRequest  {}
 message BarResponse {}
 
-message TestJsonName {
-  optional int32 field_name1 = 1;
-  optional int32 fieldName2 = 2;
-  optional int32 FieldName3 = 3;
-  optional int32 _field_name4 = 4;
-  optional int32 FIELD_NAME5 = 5;
-  optional int32 field_name6 = 6 [json_name = "@type"];
-}
-
-message TestHugeFieldNumbers {
-  optional int32 optional_int32 = 536870000;
-  optional int32 fixed_32 = 536870001;
-  repeated int32 repeated_int32 = 536870002 [packed = false];
-  repeated int32 packed_int32 = 536870003 [packed = true];
-
-  optional ForeignEnum optional_enum = 536870004;
-  optional string optional_string = 536870005;
-  optional bytes optional_bytes = 536870006;
-  optional ForeignMessage optional_message = 536870007;
-
-  optional group OptionalGroup = 536870008 {
-    optional int32 group_a = 536870009;
-  }
-
-  map<string, string> string_string_map = 536870010;
-
-  oneof oneof_field {
-    uint32 oneof_uint32 = 536870011;
-    TestAllTypes oneof_test_all_types = 536870012;
-    string oneof_string = 536870013;
-    bytes oneof_bytes = 536870014;
-  }
-
-  extensions  536860000 to 536869999;
-}
-
-extend TestHugeFieldNumbers {
-  optional TestAllTypes test_all_types = 536860000;
-}