Remove use of <iostream> where unnecessary.

net/tools/flip_server/epoll_server.h

 // 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.
 
 #ifndef NET_TOOLS_FLIP_SERVER_EPOLL_SERVER_H_
 #define NET_TOOLS_FLIP_SERVER_EPOLL_SERVER_H_
 #pragma once
 
 #include <fcntl.h>
 #include <sys/queue.h>
@@ skipping 13 matching lines @@
 // as well as providing a per-fd-registered summary of
 // events. Note that enabling this code vastly slows
 // down operations, and uses substantially more
 // memory. For these reasons, it should only be enabled when doing
 // developer debugging at his/her workstation.
 //
 // A structure called 'EventRecorder' will exist when
 // the macro is defined. See the EventRecorder class interface
 // within the EpollServer class for more details.
 #ifdef EPOLL_SERVER_EVENT_TRACING
-#include <iostream>
+#include <ostream>
 #include "base/logging.h"
 #endif
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include <sys/epoll.h>
 
 namespace net {
 
 class EpollServer;
@@ skipping 1010 matching lines @@
  private:
   EpollServer::AlarmRegToken token_;
   EpollServer* eps_;
   bool registered_;
 };
 
 }  // namespace net
 
 #endif  // NET_TOOLS_FLIP_SERVER_EPOLL_SERVER_H_