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

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https://hg.mozilla.org/integration/gaia-central/rev/3a25c41bedc5
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #20828 from jrburke/bug1025727-email-cronsync-failsafe

Bug 1025727 - [email/cronysync] Failsafe abort/window.close after failed cronsync(s) r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/8155b1459a33
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1025727 - [email/cronysync] Failsafe abort/window.close after (multiple?) failed cronsync(s)
Bumping manifests a=b2g-bump