MachMessageServer: eliminate argument redundancy

util/mach/child_port_handshake.cc

Index: util/mach/child_port_handshake.cc
diff --git a/util/mach/child_port_handshake.cc b/util/mach/child_port_handshake.cc
index 0abf1912a3da267ee1f70052219e1b45a6d28167..ca529213c2ca5a944d81f97bb9c695f5740dd8e9 100644
--- a/util/mach/child_port_handshake.cc
+++ b/util/mach/child_port_handshake.cc
@@ -34,6 +34,7 @@
 #include "util/file/fd_io.h"
 #include "util/mach/child_port.h"
 #include "util/mach/mach_extensions.h"
+#include "util/mach/mach_message.h"
 #include "util/mach/mach_message_server.h"
 
 namespace crashpad {
@@ -213,9 +214,8 @@ mach_port_t ChildPortHandshake::RunServer() {
                                      server_port_set,
                                      MACH_MSG_OPTION_NONE,
                                      MachMessageServer::kOneShot,
-                                     MachMessageServer::kNonblocking,
                                      MachMessageServer::kReceiveLargeIgnore,
-                                     MACH_MSG_TIMEOUT_NONE);
+                                     kMachMessageTimeoutNonblocking);
           if (mr == MACH_RCV_TIMED_OUT) {
             break;
           } else if (mr != MACH_MSG_SUCCESS) {