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

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https://hg.mozilla.org/integration/gaia-central/rev/eac5f068d5d3
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #17178 from cctuan/982645

Bug 982645 - [Gaia] [Build] unit test for preferences.js

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https://hg.mozilla.org/integration/gaia-central/rev/0471e039844d
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 982645 - [Gaia] [Build] unit test for preferences.js
Bumping manifests a=b2g-bump