Auto merge of #15624 - bzbarsky:remove-buttonlabel, r=Manishearth

Remove the unused :-moz-buttonlabel anonymous box.

The Gecko side is being removed in https://bugzilla.mozilla.org/show_bug.cgi?id=1340741
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bors-servo 2017-02-17 19:51:50 -08:00 committed by GitHub
commit 47ebeaa95c

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