Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/js/testbinary.proto

Index: third_party/protobuf/js/testbinary.proto
diff --git a/third_party/protobuf/js/testbinary.proto b/third_party/protobuf/js/testbinary.proto
index 116f17fb508629f69e00ea11ce4434fe4620ace6..60c70190f63e30107019b3267b57da32cc10048f 100644
--- a/third_party/protobuf/js/testbinary.proto
+++ b/third_party/protobuf/js/testbinary.proto
@@ -183,30 +183,3 @@ extend TestExtendable {
       [packed=true];
 
 }
-
-message TestMapFields {
-  map<string, string> map_string_string = 1;
-  map<string, int32> map_string_int32 = 2;
-  map<string, int64> map_string_int64 = 3;
-  map<string, bool> map_string_bool = 4;
-  map<string, double> map_string_double = 5;
-  map<string, MapValueEnum> map_string_enum = 6;
-  map<string, MapValueMessage> map_string_msg = 7;
-
-  map<int32, string> map_int32_string = 8;
-  map<int64, string> map_int64_string = 9;
-  map<bool, string> map_bool_string = 10;
-
-  optional TestMapFields test_map_fields = 11;
-  map<string, TestMapFields> map_string_testmapfields = 12;
-}
-
-enum MapValueEnum {
-  MAP_VALUE_FOO = 0;
-  MAP_VALUE_BAR = 1;
-  MAP_VALUE_BAZ = 2;
-}
-
-message MapValueMessage {
-  optional int32 foo = 1;
-}