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

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https://hg.mozilla.org/integration/gaia-central/rev/3b17367f83ac
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #26833 from mikehenrty/bug-1079206-black-theme

Bug 1079207 - Clock to have black theme color

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https://hg.mozilla.org/integration/gaia-central/rev/c44d0da460b1
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1079207 - Clock to have black theme color
Bumping manifests a=b2g-bump