Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3e0418c26d61
Author: Tzu-Lin Huang <dwi019@gmail.com>
Desc: Merge pull request #22781 from dwi2/bug1014418

Bug 1014418 - Dispatching hardware button event in Gaia

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https://hg.mozilla.org/integration/gaia-central/rev/857b27902ed9
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1014418 - Dispatching hardware button event in Gaia

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https://hg.mozilla.org/integration/gaia-central/rev/b9d373370ac2
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1090821 - [Messages][Drafts] Can't save message draft with attachment r=schung
Bumping manifests a=b2g-bump