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

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https://hg.mozilla.org/integration/gaia-central/rev/47840abc782b
Author: John Ford <john@johnford.info>
Desc: Merge pull request #14453 from arroway/bug-945111

Bug 945111 - [settings] Update permissions_table to match PermissionsTab...

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https://hg.mozilla.org/integration/gaia-central/rev/b03506352d01
Author: Stephanie Ouillon <arroway@mozilla.com>
Desc: [settings] Update permissions_table to match PermissionsTable.jsm