Remove some old support for PNaCl Scons browser tests.

ppapi/native_client/tests/ppapi_browser/extension_mime_handler/nacl.scons

 # -*- python -*-
 # Copyright (c) 2012 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 loading a NaCl-enabled Chrome Extension.  This also covers parts
 # of {ppb,ppp}_instance interfaces that are not testable any other way.
 
 # The extension registers the nacl module as a content handler for foo/bar.
 
 Import('env')
 
-# TODO(jvoung): Make a pnacl version of the nmf / or make the pexe generator
-# compatible with CopyLibsForExtension().
-if env.Bit('pnacl_generate_pexe'):
-  Return()
-
 env.Prepend(CPPDEFINES=['XP_UNIX'])
 env.Replace(TEST_DIR='${SOURCE_ROOT}/ppapi/native_client/tests/ppapi_browser/' +
                      'extension_mime_handler')
 
 nexe = env.ProgramNameForNmf('ppapi_extension_mime_handler')
 
 env.ComponentProgram(
     nexe,
     ['ppapi_extension_mime_handler.cc'],
     EXTRA_LIBS=['ppapi',
@@ skipping 23 matching lines @@
     extensions=[env.Dir('$STAGING_DIR/ppapi_extension_mime_handler')],
     mime_types=[('dat', 'foo/bar')],
     files=env.ExtractPublishedFiles(nexe))
 
 env.Depends(node, dest_copy)
 
 env.AddNodeToTestSuite(node,
                        ['chrome_browser_tests'],
                        'run_ppapi_extension_mime_handler_browser_test',
                        is_broken=env.PPAPIBrowserTesterIsBroken())