Remove use of <iostream> where unnecessary.

chrome/test/webdriver/webdriver_server.cc

 // Copyright (c) 2011 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 <signal.h>
 #include <stdlib.h>
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
-#include <iostream>
+#include <ostream>
 #include <fstream>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_number_conversions.h"
 #include "base/string_split.h"
@@ skipping 217 matching lines @@
 
   // Run until we receive command to shutdown.
   shutdown_event.Wait();
 
   // We should not reach here since the service should never quit.
   // TODO(jmikhail): register a listener for SIGTERM and break the
   // message loop gracefully.
   mg_stop(ctx);
   return (EXIT_SUCCESS);
 }