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

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https://hg.mozilla.org/integration/gaia-central/rev/384b4ecf4167
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #17656 from jmcanterafonseca/fb_jshint

Bug 982083 - [Contacts] JSHint fixes for js/fb/

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https://hg.mozilla.org/integration/gaia-central/rev/7bbd6a4efe01
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 982083 - [Contacts] JSHint fixes for js/fb/
Bumping manifests a=b2g-bump