For actions, switch bool success into an exit code.

set_bootable_flag_action.cc

Index: set_bootable_flag_action.cc
diff --git a/set_bootable_flag_action.cc b/set_bootable_flag_action.cc
index ad574ccf31e08bf358587af4dc4b1cba70e83f04..1cec31e052f279870468e5003c8f9cb9c5a5cfbc 100644
--- a/set_bootable_flag_action.cc
+++ b/set_bootable_flag_action.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
@@ -69,7 +69,7 @@ void SetBootableFlagAction::PerformAction() {
   Subprocess::SynchronousExec(command, &rc);
   TEST_AND_RETURN(rc == 0);
 
-  completer.set_success(true);
+  completer.set_code(kActionCodeSuccess);
   if (HasOutputPipe())
     SetOutputObject(GetInputObject());
 }