include what you use: errno.h in sandbox/

sandbox/linux/syscall_broker/broker_host.cc

 // Copyright 2014 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 "sandbox/linux/syscall_broker/broker_host.h"
 
+#include <errno.h>
 #include <fcntl.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/syscall.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include <string>
 #include <vector>
 
@@ skipping 205 matching lines @@
     NOTREACHED();
   }
 
   LOG(ERROR) << "Error parsing IPC request";
   return RequestStatus::FAILURE;
 }
 
 }  // namespace syscall_broker
 
 }  // namespace sandbox