Update Gaia API documents for #81af9e2fbfbbbdf6d408eb38588be01468ccaff5
    Merge pull request #14621 from hfiguiere/bug947259

Bug 947259 - Fix waitForEvent. r=julienw
(cherry picked from commit 9738f1d3bff9cc8fb5c92adf2c02f53ad6a52999)