Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/ruby/tests/generated_code.proto

-syntax = "proto3";
-
-package A.B.C;
-
-message TestMessage {
-  int32 optional_int32 = 1;
-  int64 optional_int64 = 2;
-  uint32 optional_uint32 = 3;
-  uint64 optional_uint64 = 4;
-  bool optional_bool = 5;
-  double optional_double = 6;
-  float optional_float = 7;
-  string optional_string = 8;
-  bytes optional_bytes = 9;
-  TestEnum optional_enum = 10;
-  TestMessage optional_msg = 11;
-
-  repeated int32 repeated_int32 = 21;
-  repeated int64 repeated_int64 = 22;
-  repeated uint32 repeated_uint32 = 23;
-  repeated uint64 repeated_uint64 = 24;
-  repeated bool repeated_bool = 25;
-  repeated double repeated_double = 26;
-  repeated float repeated_float = 27;
-  repeated string repeated_string = 28;
-  repeated bytes repeated_bytes = 29;
-  repeated TestEnum repeated_enum = 30;
-  repeated TestMessage repeated_msg = 31;
-
-  oneof my_oneof {
-    int32 oneof_int32 = 41;
-    int64 oneof_int64 = 42;
-    uint32 oneof_uint32 = 43;
-    uint64 oneof_uint64 = 44;
-    bool oneof_bool = 45;
-    double oneof_double = 46;
-    float oneof_float = 47;
-    string oneof_string = 48;
-    bytes oneof_bytes = 49;
-    TestEnum oneof_enum = 50;
-    TestMessage oneof_msg = 51;
-  }
-
-  map<int32, string> map_int32_string = 61;
-  map<int64, string> map_int64_string = 62;
-  map<uint32, string> map_uint32_string = 63;
-  map<uint64, string> map_uint64_string = 64;
-  map<bool, string> map_bool_string = 65;
-  map<string, string> map_string_string = 66;
-  map<string, TestMessage> map_string_msg = 67;
-  map<string, TestEnum> map_string_enum = 68;
-  map<string, int32> map_string_int32 = 69;
-  map<string, bool> map_string_bool = 70;
-
-  message NestedMessage {
-    int32 foo = 1;
-  }
-
-  NestedMessage nested_message = 80;
-}
-
-enum TestEnum {
-  Default = 0;
-  A = 1;
-  B = 2;
-  C = 3;
-}