include what you use: errno.h and string.h in net/

net/tools/flip_server/flip_in_mem_edsm_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 <errno.h>
 #include <signal.h>
 #include <stdio.h>
+#include <string.h>
 #include <sys/file.h>
 #include <sys/stat.h>
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/strings/string_split.h"
 #include "base/synchronization/lock.h"
@@ skipping 382 matching lines @@
       }
       break;
     }
     usleep(1000 * 10);  // 10 ms
   }
 
   unlink(PIDFILE);
   close(pidfile_fd);
   return 0;
 }