Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/testing/zcgzip.cc

Index: third_party/protobuf/src/google/protobuf/testing/zcgzip.cc
diff --git a/third_party/protobuf/src/google/protobuf/testing/zcgzip.cc b/third_party/protobuf/src/google/protobuf/testing/zcgzip.cc
index 9133275c8aa695879fc4c9f69db856cfdc18756e..992ddc6ed66b3cae568fa8267feb74b4a473ed48 100644
--- a/third_party/protobuf/src/google/protobuf/testing/zcgzip.cc
+++ b/third_party/protobuf/src/google/protobuf/testing/zcgzip.cc
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2009 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// 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
@@ -38,12 +38,19 @@
 // Reads data on standard input and writes compressed gzip stream to standard
 // output.
 
-#include "config.h"
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <fcntl.h>
 
+#ifdef _WIN32
+#ifndef STDIN_FILENO
+#define STDIN_FILENO 0
+#endif
+#ifndef STDOUT_FILENO
+#define STDOUT_FILENO 1
+#endif
+#endif
+
 #include <google/protobuf/io/gzip_stream.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>