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

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https://hg.mozilla.org/integration/gaia-central/rev/e41a17d99dfb
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #12974 from wanderview/contacts-webidl-fb

Bug 928890: Fix FB import for webidl changes.  r=jmcf

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https://hg.mozilla.org/integration/gaia-central/rev/81673bbcb0ae
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 928890: Fix FB import for webidl changes.