Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5ec3ded83868
Author: Sean Lee <weilonge@gmail.com>
Desc: Merge pull request #26869 from weilonge/seanlee/STK/master/Bug1112978

Bug 1112978 - Add mozbehavior.showOnlyOnce attribute for creating IDLE MODE TEXT notifications. r=frsela

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https://hg.mozilla.org/integration/gaia-central/rev/eb9186a403cd
Author: Sean Lee <selee@mozilla.com>
Desc: Bug 1112978 - Add mozbehavior.showOnlyOnce attribute for creating IDLE MODE TEXT notifications.
Bumping manifests a=b2g-bump