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

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https://hg.mozilla.org/integration/gaia-central/rev/384f6d9b0797
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #16894 from viorelaioia/bug_979308_xfail

Xfail test_cost_control_ftu with Bug 979341

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https://hg.mozilla.org/integration/gaia-central/rev/82f074bd6aa5
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Xfail test_cost_control_ftu with Bug 979341
Bumping manifests a=b2g-bump