Make chrome_browser_tests work with irt=0 again

tests/inbrowser_crash_test/nacl.scons

 # -*- python -*-
 # Copyright (c) 2011 The Native Client 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('env')
 
 # Breakpad crash reporting only works when NaCl is built into Chromium.
 if (env.Bit('disable_dynamic_plugin_loading') and
     env.Bit('host_windows') and
     env.Bit('build_x86_32')):
   expected_crash_dumps = 1
 else:
   # We are also checking that crash dumping does not work
   # unexpectedly, since that might indicate that Breakpad was enabled
   # without checking that it works securely.
   expected_crash_dumps = 0
 
 def make_crash_test_nexe(name, libs=[]):
   obj = env.ComponentObject('inbrowser_%s' % name,
                             '${MAIN_DIR}/tests/signal_handler/%s.c' % name)
   nexe = env.ComponentProgram(
       'inbrowser_%s_${TARGET_FULLARCH}' % name, obj,
       EXTRA_LIBS=libs + [
-          'srpc', 'platform', 'gio', 'imc', 'imc_syscalls', 'pthread',
+          'srpc', 'platform', 'gio', 'imc', 'imc_syscalls', '${PTHREAD_LIBS}',
           '${NON_PPAPI_BROWSER_LIBS}'])
   return nexe
 
 env.Append(CPPDEFINES = ['IN_BROWSER'])
 
 # This crash in trusted code should produce a crash dump.
 crash_test_nexe = make_crash_test_nexe('crash_test')
 node = env.PPAPIBrowserTester(
     'inbrowser_trusted_crash_in_startup_test.out',
     python_tester_script=env.File('crash_dump_tester.py'),
@@ skipping 32 matching lines @@
     'inbrowser_untrusted_crash_test.out',
     python_tester_script=env.File('crash_dump_tester.py'),
     url='untrusted_crash.html',
     files=[crash_test_nexe,
            env.File('inbrowser_crash_test.nmf'),
            env.File('untrusted_crash.html')],
     args=['--expected_crash_dumps=0'])
 env.AddNodeToTestSuite(
     node, ['chrome_browser_tests'], 'run_inbrowser_untrusted_crash_test',
     is_broken=env.PPAPIBrowserTesterIsBroken())