Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/src/google/protobuf/compiler/plugin.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 35 matching lines @@
 
 syntax = "proto2";
 package google.protobuf.compiler;
 option java_package = "com.google.protobuf.compiler";
 option java_outer_classname = "PluginProtos";
 
 option go_package = "plugin_go";
 
 import "google/protobuf/descriptor.proto";
 
-// The version number of protocol compiler.
-message Version {
-  optional int32 major = 1;
-  optional int32 minor = 2;
-  optional int32 patch = 3;
-  // A suffix for alpha, beta or rc release, e.g., "alpha-1", "rc2". It should
-  // be empty for mainline stable releases.
-  optional string suffix = 4;
-}
-
 // An encoded CodeGeneratorRequest is written to the plugin's stdin.
 message CodeGeneratorRequest {
   // The .proto files that were explicitly listed on the command-line.  The
   // code generator should generate code only for these files.  Each file's
   // descriptor will be included in proto_file, below.
   repeated string file_to_generate = 1;
 
   // The generator parameter passed on the command-line.
   optional string parameter = 2;
 
   // FileDescriptorProtos for all files in files_to_generate and everything
   // they import.  The files will appear in topological order, so each file
   // appears before any file that imports it.
   //
   // protoc guarantees that all proto_files will be written after
   // the fields above, even though this is not technically guaranteed by the
   // protobuf wire format.  This theoretically could allow a plugin to stream
   // in the FileDescriptorProtos and handle them one by one rather than read
   // the entire set into memory at once.  However, as of this writing, this
   // is not similarly optimized on protoc's end -- it will store all fields in
   // memory at once before sending them to the plugin.
   repeated FileDescriptorProto proto_file = 15;
-
-  // The version number of protocol compiler.
-  optional Version compiler_version = 3;
 }
 
 // The plugin writes an encoded CodeGeneratorResponse to stdout.
 message CodeGeneratorResponse {
   // Error message.  If non-empty, code generation failed.  The plugin process
   // should exit with status code zero even if it reports an error in this way.
   //
   // This should be used to indicate errors in .proto files which prevent the
   // code generator from generating correct code.  Errors which indicate a
   // problem in protoc itself -- such as the input CodeGeneratorRequest being
@@ skipping 53 matching lines @@
     // command line.
     //
     // If |insertion_point| is present, |name| must also be present.
     optional string insertion_point = 2;
 
     // The file contents.
     optional string content = 15;
   }
   repeated File file = 15;
 }