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

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https://hg.mozilla.org/integration/gaia-central/rev/079450217248
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #19797 from eeejay/bug-1013005

Bug 1013005 - Use role of listbox/option in contacts list.

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https://hg.mozilla.org/integration/gaia-central/rev/8a0300647de8
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1013005 - Use role of listbox/option in contacts list.
Bumping manifests a=b2g-bump