[Buildbot] #3300: deprecationDecorator() takes exactly 1 argument (2 given)

[Buildbot trac]

#3300: deprecationDecorator() takes exactly 1 argument (2 given)
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Reporter:  vlovich   |       Owner:
    Type:  defect    |      Status:  new
Priority:  critical  |   Milestone:  undecided
 Version:  master    |  Resolution:
Keywords:            |
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Comment (by vlovich):

 My step is a BuildStep with a ShellMixin.

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Ticket URL: <http://trac.buildbot.net/ticket/3300#comment:1>
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