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

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https://hg.mozilla.org/integration/gaia-central/rev/49915c05d4ef
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #10388 from timdream/facebook-oauth-fix

Bug 882363 - Only enable Facebook functionality if the app id is part of the partner customization, r=@yurenju, a=tef+

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https://hg.mozilla.org/integration/gaia-central/rev/debf7ab07509
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 882363 - Only enable Facebook functionality if the app id is part of the partner customization.