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

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https://hg.mozilla.org/integration/gaia-central/rev/90e0d49229d7
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #12737 from alivedise/bugzilla/922713/permission-dialog-button-text

Bug 922713 - Permission request button text, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/37f020bd45fc
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 922713 - Permission request button text.