Fixing gcc 4.7 building problems.

chrome/browser/chromeos/process_proxy/process_output_watcher.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 "chrome/browser/chromeos/process_proxy/process_output_watcher.h"
 
 #include <algorithm>
 #include <cstdio>
 #include <cstring>
 
 #include <sys/ioctl.h>
 #include <sys/select.h>
+#include <unistd.h>
 
 #include "base/eintr_wrapper.h"
 #include "base/logging.h"
 
 namespace {
 
 void InitReadFdSet(int out_fd, int stop_fd, fd_set* set) {
   FD_ZERO(set);
   if (out_fd != -1)
     FD_SET(out_fd, set);
@@ skipping 83 matching lines @@
     CloseFd(fd);
 
     // We have lost contact with the process, so report it.
     on_read_callback_.Run(PROCESS_OUTPUT_TYPE_EXIT, "");
   }
 }
 
 void ProcessOutputWatcher::OnStop() {
   delete this;
 }