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Scripts like that usually do not require a --option if this is a
mandatory singleton argument. Also, forgetting to pass the extension
sounds like something that the script could simply handle.

BUG=None

Review URL: https://codereview.chromium.org/286423002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275755 0039d316-1c4b-4281-b951-d872f2087c98