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diff --git a/third_party/protobuf/src/google/protobuf/compiler/subprocess.h b/third_party/protobuf/src/google/protobuf/compiler/subprocess.h
deleted file mode 100644
index 2513863144..0000000000
--- a/third_party/protobuf/src/google/protobuf/compiler/subprocess.h
+++ /dev/null
@@ -1,108 +0,0 @@
-// 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.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-
-#ifndef GOOGLE_PROTOBUF_COMPILER_SUBPROCESS_H__
-#define GOOGLE_PROTOBUF_COMPILER_SUBPROCESS_H__
-
-#ifdef _WIN32
-#define WIN32_LEAN_AND_MEAN   // right...
-#include <windows.h>
-#else  // _WIN32
-#include <sys/types.h>
-#include <unistd.h>
-#endif  // !_WIN32
-#include <google/protobuf/stubs/common.h>
-
-#include <string>
-
-
-namespace google {
-namespace protobuf {
-
-class Message;
-
-namespace compiler {
-
-// Utility class for launching sub-processes.
-class LIBPROTOC_EXPORT Subprocess {
- public:
-  Subprocess();
-  ~Subprocess();
-
-  enum SearchMode {
-    SEARCH_PATH,   // Use PATH environment variable.
-    EXACT_NAME     // Program is an exact file name; don't use the PATH.
-  };
-
-  // Start the subprocess.  Currently we don't provide a way to specify
-  // arguments as protoc plugins don't have any.
-  void Start(const string& program, SearchMode search_mode);
-
-  // Serialize the input message and pipe it to the subprocess's stdin, then
-  // close the pipe.  Meanwhile, read from the subprocess's stdout and parse
-  // the data into *output.  All this is done carefully to avoid deadlocks.
-  // Returns true if successful.  On any sort of error, returns false and sets
-  // *error to a description of the problem.
-  bool Communicate(const Message& input, Message* output, string* error);
-
-#ifdef _WIN32
-  // Given an error code, returns a human-readable error message.  This is
-  // defined here so that CommandLineInterface can share it.
-  static string Win32ErrorMessage(DWORD error_code);
-#endif
-
- private:
-#ifdef _WIN32
-  DWORD process_start_error_;
-  HANDLE child_handle_;
-
-  // The file handles for our end of the child's pipes.  We close each and
-  // set it to NULL when no longer needed.
-  HANDLE child_stdin_;
-  HANDLE child_stdout_;
-
-#else  // _WIN32
-  pid_t child_pid_;
-
-  // The file descriptors for our end of the child's pipes.  We close each and
-  // set it to -1 when no longer needed.
-  int child_stdin_;
-  int child_stdout_;
-
-#endif  // !_WIN32
-};
-
-}  // namespace compiler
-}  // namespace protobuf
-
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_SUBPROCESS_H__