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

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https://hg.mozilla.org/integration/gaia-central/rev/dea78f0c204c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15944 from KevinGrandon/bug_967098_follow_up_styling

Bug 967098 - Follow-up, select box styling r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/30c236dae32f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 967098 - Follow-up, select box styling r=vingtetun
Bumping manifests a=b2g-bump