Add a scons pnacl finalize step for pnacl_generate_pexe tests.

tests/subprocess/nacl.scons

Index: tests/subprocess/nacl.scons
diff --git a/tests/subprocess/nacl.scons b/tests/subprocess/nacl.scons
index 42d6d7aa1fb223f18fa61f5bc6b4f6067320d977..4702c2ab47bff838c86ae5cf0b6b60339e936fd5 100644
--- a/tests/subprocess/nacl.scons
+++ b/tests/subprocess/nacl.scons
@@ -36,8 +36,7 @@ subprogram_nexe = env.ComponentProgram('subprogram',
                                                    '${PTHREAD_LIBS}',
                                                    '${NONIRT_LIBS}'])
 
-if env.ShouldTranslateToNexe(subprogram_nexe):
-  subprogram_nexe = env.GetTranslatedNexe(subprogram_nexe)
+subprogram_nexe = env.GetTranslatedNexe(subprogram_nexe)
 
 if env.Bit('tests_use_irt'):
   irt_var_flags = [ '--var', 'irt_nexe', env.GetIrtNexe() ]