Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/io/gzip_stream.h

Index: third_party/protobuf/src/google/protobuf/io/gzip_stream.h
diff --git a/third_party/protobuf/src/google/protobuf/io/gzip_stream.h b/third_party/protobuf/src/google/protobuf/io/gzip_stream.h
index 365e9ea5f58ce41aa877df947d50d8bd3e920324..8244500010d7482a0e520891323c1caee3758f58 100644
--- a/third_party/protobuf/src/google/protobuf/io/gzip_stream.h
+++ b/third_party/protobuf/src/google/protobuf/io/gzip_stream.h
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 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
@@ -99,6 +99,7 @@ class LIBPROTOBUF_EXPORT GzipInputStream : public ZeroCopyInputStream {
   void* output_buffer_;
   void* output_position_;
   size_t output_buffer_length_;
+  int64 byte_count_;
 
   int Inflate(int flush);
   void DoNextOutput(const void** data, int* size);
@@ -118,7 +119,7 @@ class LIBPROTOBUF_EXPORT GzipOutputStream : public ZeroCopyOutputStream {
     ZLIB = 2,
   };
 
-  struct LIBPROTOBUF_EXPORT Options {
+  struct Options {
     // Defaults to GZIP.
     Format format;