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

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https://hg.mozilla.org/integration/gaia-central/rev/379d29547b17
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #17919 from cctuan/990435-master

Bug 990435 - [tarako] the two homescreens randomly overlapped with each ...

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https://hg.mozilla.org/integration/gaia-central/rev/16631d6aba2f
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 990435 - [tarako] the two homescreens randomly overlapped with each other after wake up from sleep
Bumping manifests a=b2g-bump