Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/src/google/protobuf/unittest.proto

Index: third_party/protobuf/src/google/protobuf/unittest.proto
diff --git a/third_party/protobuf/src/google/protobuf/unittest.proto b/third_party/protobuf/src/google/protobuf/unittest.proto
index 96289cc55bdad443c2bc56d408edaeca00814e69..da56ae0a2449c6396b4963995b73fbcbcdb006d9 100644
--- a/third_party/protobuf/src/google/protobuf/unittest.proto
+++ b/third_party/protobuf/src/google/protobuf/unittest.proto
@@ -195,7 +195,6 @@ message TestDeprecatedFields {
 // that.
 message ForeignMessage {
   optional int32 c = 1;
-  optional int32 d = 2;
 }
 
 enum ForeignEnum {
@@ -878,42 +877,3 @@ service TestService {
 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;
-}