Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/python/ez_setup.py

 #!python
 
 # This file was obtained from:
 #   http://peak.telecommunity.com/dist/ez_setup.py
 # on 2011/1/21.
 
 """Bootstrap setuptools installation
 
 If you want to use setuptools in your package's setup.py, just include this
 file in the same directory with it, and add this to the top of your setup.py::
@@ skipping 89 matching lines @@
     was_imported = 'pkg_resources' in sys.modules or 'setuptools' in sys.modules
     def do_download():
         egg = download_setuptools(version, download_base, to_dir, download_delay)
         sys.path.insert(0, egg)
         import setuptools; setuptools.bootstrap_install_from = egg
     try:
         import pkg_resources
     except ImportError:
         return do_download()       
     try:
-        return do_download()
         pkg_resources.require("setuptools>="+version); return
     except pkg_resources.VersionConflict, e:
         if was_imported:
             print >>sys.stderr, (
             "The required version of setuptools (>=%s) is not available, and\n"
             "can't be installed while this script is running. Please install\n"
             " a more recent version first, using 'easy_install -U setuptools'."
             "\n\n(Currently using %r)"
             ) % (version, e.args[0])
             sys.exit(2)
@@ skipping 154 matching lines @@
     f = open(srcfile,'w')
     f.write(src)
     f.close()
 
 
 if __name__=='__main__':
     if len(sys.argv)>2 and sys.argv[1]=='--md5update':
         update_md5(sys.argv[2:])
     else:
         main(sys.argv[1:])