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Purpose of this change is to help future-proof the script. Since old versions
of this script may be run when signing old builds, removing this check for
too many args allows us to add new params on the calling side without breaking
old builds.

BUG=None
TEST=None
Review URL: https://chromiumcodereview.appspot.com/10826076

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149091 0039d316-1c4b-4281-b951-d872f2087c98