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

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https://hg.mozilla.org/integration/gaia-central/rev/479f26654c31
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #12486 from ian-liu/bluetooth/Bug895480_Bluetooth_app_tries_to_handle_Share_URL_activity_and_fails

Bug 895480 - Bluetooth app tries to handle Share URL activity and fails, r=@djf, gaye

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https://hg.mozilla.org/integration/gaia-central/rev/0a70431f376b
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 895480 - Bluetooth app tries to handle Share URL activity and fails