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

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https://hg.mozilla.org/integration/gaia-central/rev/404e97d5401d
Author: Dave Huseby <dhuseby@mozilla.com>
Desc: Merge pull request #15261 from AutomatedTester/bug959204

Bug 959204: correct varible name in PowerDataRun; r=huseby

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https://hg.mozilla.org/integration/gaia-central/rev/b36fc91ab50a
Author: AutomatedTester <dburns@mozilla.com>
Desc: Bug 959204: correct varible name in PowerDataRun; r=huseby