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

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https://hg.mozilla.org/integration/gaia-central/rev/da3ae3f7069d
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #16294 from vingtetun/bug970849

Bug 970940 - [JavaScript Error: 'TypeError: this._port is null' {file: a...

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https://hg.mozilla.org/integration/gaia-central/rev/d198fdc6199a
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 970940 - [JavaScript Error: 'TypeError: this._port is null' {file: app://system.gaiamobile.org/js/rocketbar.js line: 311}]. r=kgrandon
Bumping manifests a=b2g-bump