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

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https://hg.mozilla.org/integration/gaia-central/rev/bd85070173b4
Author: RickyChien <ricky060709@gmail.com>
Desc: Merge pull request #18834 from RickyChien/bug-988259-follow

Bug 988259 - Follow-up, update gaia_node_modules.revision r=me

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https://hg.mozilla.org/integration/gaia-central/rev/027f1d4668f4
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 988259 - Follow-up, update gaia_node_modules.revision
Bumping manifests a=b2g-bump