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

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https://hg.mozilla.org/integration/gaia-central/rev/3b558b81bc51
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #10152 from leob2g/Bug_878662_Sound_Manager_CEWarningDialog_is_displayed_at_CEWarningVol_+_1

Bug 878662 - [System][Sound Manager] CEWarningDialog is displayed in incorrect timing, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/415ee260023a
Author: hanj.kim <hanj.kim@lge.com>
Desc: Bug 878662 - [System][Sound Manager] CEWarningDialog is displayed at CEWarningVol + 1