Get rid of assumptions about ".nexe" extension.

tests/ppapi_gles_book/nacl.scons

 # -*- python -*-
 # Copyright 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.
 
 # OpenGL ES examples
 
 Import('env')
 
 env.Prepend(CPPDEFINES=['XP_UNIX'])
@@ skipping 37 matching lines @@
         'Chapter_9/Simple_TextureCubemap/Simple_TextureCubemap.c'],
     'simple_vertex_shader': [
         'Chapter_8/Simple_VertexShader/Simple_VertexShader.c'],
     'stencil_test': [
         'Chapter_11/Stencil_Test/Stencil_Test.c'],
     'texture_wrap': [
         'Chapter_9/TextureWrap/TextureWrap.c'],
 }
 
 for demo, sources in gles_book_examples.iteritems():
-    nexe_name = ('ppapi_gles_book_%s_%s.nexe'
+    nexe_name = ('ppapi_gles_book_%s_%s'
                  % (demo, env.get('TARGET_FULLARCH')))
     nmf_name = 'ppapi_gles_book_' + demo + '.nmf'
     nexe = env.ComponentProgram(
         nexe_name,
         ['demos/gles2_book/demo_' + demo + '.cc'] + sources,
         EXTRA_LIBS=['${PPAPI_LIBS}',
                     'ppapi_cpp',
                     'ppapi_gles_demo',
                     'ppapi_cpp',
                     'ppapi_gles2',
                     'm'])
     env.Publish(nexe_name, 'run',
                 ['ppapi_gles_book.html',
                  nmf_name])
     test = env.PPAPIBrowserTester('ppapi_gles_book_' + demo + '.out',
                                   url='ppapi_gles_book.html?manifest='
                                       + nmf_name,
                                   files=[nexe,
                                          env.File(nmf_name),
                                          env.File('ppapi_gles_book.html')],
                                   args=['--enable_experimental_js'])
     env.AddNodeToTestSuite(test,
                            ['chrome_browser_tests'],
                            'run_ppapi_gles_book_' + demo + '_test',
                            is_broken=env.PPAPIBrowserTesterIsBroken())