Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a1f4dbe091d7
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #12971 from ian-liu/bluetooth/Bug915584_revise_flow_for_receiving_file_without_SDCard

Bug 915584 - [Bluetooth][Contacts] Receiving a contact via bluetooth when the device does not have SD Card flow differs from the expected, r=@alivedise

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https://hg.mozilla.org/integration/gaia-central/rev/170ec7f9d9a9
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 915584 - [Bluetooth][Contacts] Receiving a contact via bluetooth when the device does not have SD Card flow differs from the expected

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https://hg.mozilla.org/integration/gaia-central/rev/d3308d368858
Author: Julien Wajsberg <felash@gmail.com>
Desc: Revert "Merge pull request #12802 from caiolima/bug-815093"

This reverts commit 47b3bdf7a6e9396db6e09ac0453f782953ceda7a, reversing
changes made to 1d832634550de25526eaf93137940f9fd73a4c7f.