scons: excise more scons references from the code base

tools/export_tarball/export_tarball.py

 #!/usr/bin/python
 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 This tool creates a tarball with all the sources, but without .svn directories.
 
 It can also remove files which are not strictly required for build, so that
 the resulting tarball can be reasonably small (last time it was ~110 MB).
@@ skipping 21 matching lines @@
     'native_client/tests',
     'net/data/cache_tests',
     'src/chrome/test/data',
     'o3d/documentation',
     'o3d/samples',
     'o3d/tests',
     'third_party/angle/samples/gles2_book',
     'third_party/hunspell_dictionaries',
     'third_party/hunspell/tests',
     'third_party/lighttpd',
-    'third_party/scons',
     'third_party/sqlite/test',
     'third_party/vc_80',
     'third_party/xdg-utils/tests',
     'third_party/yasm/source/patched-yasm/modules/arch/x86/tests',
     'third_party/yasm/source/patched-yasm/modules/dbgfmts/dwarf2/tests',
     'third_party/yasm/source/patched-yasm/modules/objfmts/bin/tests',
     'third_party/yasm/source/patched-yasm/modules/objfmts/coff/tests',
     'third_party/yasm/source/patched-yasm/modules/objfmts/elf/tests',
     'third_party/yasm/source/patched-yasm/modules/objfmts/macho/tests',
     'third_party/yasm/source/patched-yasm/modules/objfmts/rdf/tests',
@@ skipping 54 matching lines @@
   archive.set_remove_nonessential_files(options.remove_nonessential_files)
   try:
     archive.add(GetSourceDirectory(), arcname=output_basename)
   finally:
     archive.close()
 
   return 0
 
 if __name__ == "__main__":
   sys.exit(main(sys.argv[1:]))