Revert msan patch

[inferno-chromium]

Traceback (most recent call last):
  File "/usr/local/bin/msan_build.py", line 459, in <module>
    main()
  File "/usr/local/bin/msan_build.py", line 455, in main
    builder.build(package_name, args.output_dir, args.create_subdirs)
  File "/usr/local/bin/msan_build.py", line 368, in build
    pkg = get_package(package_name)
  File "/usr/local/bin/msan_build.py", line 255, in get_package
    return module.Package(version)
  File "/usr/local/bin/packages/nettle.py", line 37, in __init__
    super(Package, self).__init__('nettle', apt_version)
TypeError: super() argument 1 must be type, not classobj

[inferno-chromium]

Not building at all and affecting base builder change.

[oliverchang]

thanks!

[divergentdave]

This was probably due to e510d35. We should ignore the useless-object-inheritance lint instead, as these scripts still need to run in Python 2.