I mistranslated the boolean success value of the old initListBuild
method. Simplifying it to just use a promise rejection should be
equivalent and simpler, since this is only run from the update
method of WindowsJumpLists, and the call sites for that don't do
anything afterwards.
Differential Revision: https://phabricator.services.mozilla.com/D2244
--HG--
extra : moz-landing-system : lando