Get rid of assumptions about ".nexe" extension.

tests/ppapi_simple_tests/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')
 
 env.Prepend(CPPDEFINES=['XP_UNIX'])
 
 TESTS = [('audio', ('audio',)),
          ('graphics2d',('graphics2d',)),
          ('event', ('event',)),
          ('file', ('file1', 'file2')),
          ]
 
 for test_exe, test_inputs in TESTS:
-  nexe = env.ComponentProgram('ppapi_simple_' + test_exe + '.nexe',
+  nexe = env.ComponentProgram('ppapi_simple_' + test_exe,
                               [test_exe + '.cc'],
                               EXTRA_LIBS=['${PPAPI_LIBS}',
                                           'ppapi_cpp',
                                           'platform',
                                           'gio',
                                           'pthread',
                                           'm',
                                           ])
 
   for test in test_inputs:
     node = env.SelUniversalTest(
         'ppapi_simple_' + test + '.out',
+        nexe,
         sel_universal_flags=[
             '--silence_nexe',
             '--command_file',
             env.File('sel_universal_ppapi_replay_prolog.stdin'),
             '--command_file',
             env.File(test +'.stdin'),
             ],
         uses_ppapi=True,
-        command=[nexe],
         stdout_golden=env.File(test + '.stdout'),
         )
 
     env.AddNodeToTestSuite(node,
                            ['small_tests', 'sel_ldr_tests'],
                            'run_ppapi_simple_' + test  + '_test')