Update //third_party/protobuf to version 3.

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

Index: third_party/protobuf/src/google/protobuf/io/gzip_stream.cc
diff --git a/third_party/protobuf/src/google/protobuf/io/gzip_stream.cc b/third_party/protobuf/src/google/protobuf/io/gzip_stream.cc
index fe1f3319d31baaf2e4302a7ec26008d2b28fa9e1..1be6c8635952429b820b2a9570261031fd0fb77c 100644
--- a/third_party/protobuf/src/google/protobuf/io/gzip_stream.cc
+++ b/third_party/protobuf/src/google/protobuf/io/gzip_stream.cc
@@ -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
@@ -33,12 +33,12 @@
 // This file contains the implementation of classes GzipInputStream and
 // GzipOutputStream.
 
-#include "config.h"
 
 #if HAVE_ZLIB
 #include <google/protobuf/io/gzip_stream.h>
 
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/logging.h>
 
 namespace google {
 namespace protobuf {
@@ -48,7 +48,8 @@ static const int kDefaultBufferSize = 65536;
 
 GzipInputStream::GzipInputStream(
     ZeroCopyInputStream* sub_stream, Format format, int buffer_size)
-    : format_(format), sub_stream_(sub_stream), zerror_(Z_OK) {
+    : format_(format), sub_stream_(sub_stream), zerror_(Z_OK), byte_count_(0) {
+  zcontext_.state = Z_NULL;
   zcontext_.zalloc = Z_NULL;
   zcontext_.zfree = Z_NULL;
   zcontext_.opaque = Z_NULL;
@@ -134,6 +135,7 @@ bool GzipInputStream::Next(const void** data, int* size) {
     if (zcontext_.next_out != NULL) {
       // sub_stream_ may have concatenated streams to follow
       zerror_ = inflateEnd(&zcontext_);
+      byte_count_ += zcontext_.total_out;
       if (zerror_ != Z_OK) {
         return false;
       }
@@ -178,8 +180,12 @@ bool GzipInputStream::Skip(int count) {
   return ok;
 }
 int64 GzipInputStream::ByteCount() const {
-  return zcontext_.total_out +
-    (((uintptr_t)zcontext_.next_out) - ((uintptr_t)output_position_));
+  int64 ret = byte_count_ + zcontext_.total_out;
+  if (zcontext_.next_out != NULL && output_position_ != NULL) {
+    ret += reinterpret_cast<uintptr_t>(zcontext_.next_out) -
+           reinterpret_cast<uintptr_t>(output_position_);
+  }
+  return ret;
 }
 
 // =========================================================================