Update //third_party/protobuf to version 3.

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

 // 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
 // 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
@@ skipping 78 matching lines @@
   Format format_;
 
   ZeroCopyInputStream* sub_stream_;
 
   z_stream zcontext_;
   int zerror_;
 
   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);
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(GzipInputStream);
 };
 
 
 class LIBPROTOBUF_EXPORT GzipOutputStream : public ZeroCopyOutputStream {
  public:
   // Format key for constructor
   enum Format {
     // GZIP streams have some extra header data for file attributes.
     GZIP = 1,
 
     // Simpler zlib stream format.
     ZLIB = 2,
   };
 
-  struct LIBPROTOBUF_EXPORT Options {
+  struct Options {
     // Defaults to GZIP.
     Format format;
 
     // What size buffer to use internally.  Defaults to 64kB.
     int buffer_size;
 
     // A number between 0 and 9, where 0 is no compression and 9 is best
     // compression.  Defaults to Z_DEFAULT_COMPRESSION (see zlib.h).
     int compression_level;
 
@@ skipping 68 matching lines @@
   int Deflate(int flush);
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(GzipOutputStream);
 };
 
 }  // namespace io
 }  // namespace protobuf
 
 }  // namespace google
 #endif  // GOOGLE_PROTOBUF_IO_GZIP_STREAM_H__