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

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https://hg.mozilla.org/integration/gaia-central/rev/11e72cdcb0ad
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #10627 from gasolin/customfb

Bug 883344 Only use default facebook app id if is mozilla partner build, r=tim

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https://hg.mozilla.org/integration/gaia-central/rev/34eff1a5fb59
Author: gasolin <gasolin@gmail.com>
Desc: Bug 883344 Only use default facebook app id if is mozilla partner build