Get rid of assumptions about ".nexe" extension.

tests/browser_startup_time/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.
 
 # Test startup time for loading a basic PPAPI nexe in the browser.
 
 Import('env')
 
 # Pull in the ppapi_test_example as a "barebones" PPAPI startup example.
 # Hope it does not change to do more than just the barebones.
 # We must make a separate build though, to get a different nexe "key"
 # for the env.Publish() / env.ExtractPublishedFiles() magic.
-nexe = 'browser_startup_time_%s.nexe' % env.get('TARGET_FULLARCH')
+nexe_name = 'browser_startup_time_${TARGET_FULLARCH}'
 
 # Build object file separately to prevent crud left in the source directory.
 browser_startup_obj = env.ComponentObject(
     'pnacl_test_example',
     '${SCONSTRUCT_DIR}/tests/ppapi_test_example/ppapi_test_example.cc')
 
 browser_startup_nexe = env.ComponentProgram(
-    nexe,
+    nexe_name,
     [browser_startup_obj],
     EXTRA_LIBS=['${PPAPI_LIBS}',
                 'ppapi_test_lib',
                 'platform',  # for CHECK
                 'pthread',
                 'gio',
                 ])
 
 # Borrow the smoke tests.
 borrowed_files = [env.File('${STAGING_DIR}/ppapi_test_example.js')]
 
-env.Publish(nexe, 'run',
+env.Publish(nexe_name, 'run',
             ['browser_startup_time.html',
              'browser_startup_time.nmf',
              'browser_startup_time.js'])
 
 test_name = 'browser_startup_time.out'
 output_processor = ['${PYTHON}',
                     str(env.File(
                         '${SCONSTRUCT_DIR}/tools/process_perf_output.py')),
                     test_name,
                     env.GetPerfEnvDescription()]
 
 node = env.PPAPIBrowserTester(
     test_name,
     url='browser_startup_time.html',
-    files=env.ExtractPublishedFiles(nexe) + borrowed_files,
+    files=env.ExtractPublishedFiles(nexe_name) + borrowed_files,
     args=['--enable_experimental_js'],
     process_output=output_processor,
     # Assume verbosity level of 1 will give us NaClLogs for sel_ldr times.
     log_verbosity=1)
 
 # TODO(jvoung): use a single test suite when either
 # (a) performance_tests are always run, or
 # (b) we have decided to just fold this test into chrome_browser_tests.
 test_suites = ['chrome_browser_tests', 'performance_tests']
 env.AddNodeToTestSuite(node,
                        test_suites,
                        'run_browser_startup_time_test',
                        # This test relies on NACLLOG, which must be able to
                        # open a file. This won't work with the outer sandbox
                        # which is enabled in some cases.
                        is_broken=env.PPAPIBrowserTesterIsBroken() or
                        env.Bit('disable_dynamic_plugin_loading'))
 
 # Also check the size of this nexe.
 node = env.FileSizeTest('browser_startup_size.out',
-                        nexe)
+                        browser_startup_nexe)
 env.AddNodeToTestSuite(node,
                        test_suites,
                        'run_browser_startup_size_test')