AU: Remove obsolete postinst --postcommit call.

postinstall_runner_action.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 The Chromium OS 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 "update_engine/postinstall_runner_action.h"
 #include <sys/mount.h>
 #include <stdlib.h>
 #include <vector>
 #include "update_engine/subprocess.h"
 #include "update_engine/utils.h"
 
@@ skipping 39 matching lines @@
       LOG(ERROR) << "Unable to mount destination device " << install_device
                  << " onto " << temp_dir;
       return;
     }
     ScopedFilesystemUnmounter unmounter(temp_dir);
 
     // run postinstall script
     vector<string> command;
     command.push_back(temp_dir + kPostinstallScript);
     command.push_back(install_device);
-    command.push_back(precommit_ ? "" : "--postcommit");
     rc = 0;
     TEST_AND_RETURN(Subprocess::SynchronousExec(command, &rc));
     bool success = (rc == 0);
     if (!success) {
       LOG(ERROR) << "Postinst command failed with code: " << rc;
       return;
     }
   }
 
   if (HasOutputPipe()) {
     SetOutputObject(install_plan);
   }
   completer.set_code(kActionCodeSuccess);
 }
 
 }  // namespace chromeos_update_engine