Backout rev 89551867dc2a for having the wrong bug number in the commit message (was bug 885762, should be bug 885761). Pointed out by Ms3ger. no_r=me.

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extra : rebase_source : 2171490306c5559161f34e537f035c2c69e1fdd2
Bug 885761 - Remove Token::t_op and KeywordInfo::op. r=till.

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extra : rebase_source : f1d267e99b76d1ed575beb214fbc0360cf8ebe7b