[NaCl SDK] Additional fix for r207878: Add dummy unistd.h for Windows.

native_client_sdk/src/libraries/nacl_io_test/mount_http_test.cc

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <fcntl.h>
 #include <gmock/gmock.h>
 #include <ppapi/c/ppb_file_io.h>
 #include <ppapi/c/pp_errors.h>
 #include <ppapi/c/pp_instance.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 
 #include "mock_util.h"
 #include "nacl_io/kernel_intercept.h"
 #include "nacl_io/mount_http.h"
 #include "nacl_io/mount_node_dir.h"
 #include "nacl_io/osdirent.h"
+#include "nacl_io/osunistd.h"
 #include "pepper_interface_mock.h"
 
 using ::testing::_;
 using ::testing::DoAll;
 using ::testing::Mock;
 using ::testing::Return;
 using ::testing::SetArgPointee;
 using ::testing::StrEq;
 
 
@@ skipping 570 matching lines @@
   memset(&buf[0], 0, sizeof(buf));
 
   ExpectOpen("GET");
   ExpectHeaders("Range: bytes=10-18\n");
   SetResponse(200, "Content-Length: 20\n");
   SetResponseBody("0123456789abcdefghij");
   EXPECT_EQ(0, node_->Read(10, buf, sizeof(buf) - 1, &result_bytes));
   EXPECT_EQ(sizeof(buf) - 1, result_bytes);
   EXPECT_STREQ("abcdefghi", &buf[0]);
 }