autotest: Fix problem with logging_UserCrash tgz file being masked.

client/site_tests/logging_UserCrash/logging_UserCrash.py

 # 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.
 
 import grp, logging, os, pwd, re, stat, subprocess
 from signal import SIGSEGV
 from autotest_lib.client.bin import site_crash_test, site_utils, test
 from autotest_lib.client.common_lib import error, utils
 
 _CORE_PATTERN = '/proc/sys/kernel/core_pattern'
@@ skipping 35 matching lines @@
             raise error.TestFail('core pattern should have been core, not %s' %
                                  output)
 
 
     def _prepare_crasher(self):
         """Extract the crasher and set its permissions.
 
         crasher is only gzipped to subvert Portage stripping.
         """
         self._crasher_path = os.path.join(self.srcdir, 'crasher_nobreakpad')
-        utils.system('cd %s; tar xzf crasher.tgz' %
+        utils.system('cd %s; tar xzf crasher.tgz-unmasked' %
                      self.srcdir)
 
 
     def _populate_symbols(self):
         """Set up Breakpad's symbol structure.
 
         Breakpad's minidump processor expects symbols to be in a directory
         hierarchy:
           <symbol-root>/<module_name>/<file_id>/<module_name>.sym
         """
@@ skipping 382 matching lines @@
     def run_once(self):
         self.run_crash_tests(['reporter_startup',
                               'reporter_shutdown',
                               'no_crash',
                               'chronos_nobreakpad_crasher',
                               'root_nobreakpad_crasher',
                               'max_enqueued_crashes',
                               'core_file_persists_in_debug',
                               'core_file_removed_in_production'],
                               initialize_crash_reporter = True)