Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/437003c4d50d
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 1082444 - Handle additional events when FxA EntrySheet is displayed. r=ferjm

  * Specifically, listen for 'home', 'holdhome', and 'activityrequesting', and
    when those are caught, if the EntrySheet is open, close it.
  * Also, don't try to open the EntrySheet if navigator.onLine is false; show
    an error message instead.
Bumping manifests a=b2g-bump