It was added in bug 1219150, but it seems it is unused. :Yoric, do you think if we could remove it?
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It was added in bug 1219150, but it seems it is unused. :Yoric, do you think if we could remove it? https://searchfox.org/mozilla-central/rev/d143f8ce30d1bcfee7a1227c27bf876a85f8cede/dom/events/EventStateManager.h#276