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

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https://hg.mozilla.org/integration/gaia-central/rev/1cbab43be164
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20837 from daleharvey/1027463

Bug 1027463 - Check for element before clearing. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/abbee496ef14
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1027463 - Check for element before clearing. r=kgrandon
Bumping manifests a=b2g-bump