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

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https://hg.mozilla.org/integration/gaia-central/rev/d84230bbf0ca
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #12685 from KevinGrandon/bug_923871_defer_sim_import

Bug 923871 - [Contacts] Do not load import_sim_contacts.js for list display r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/85b4bd361fab
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 923871 - [Contacts] Do not load import_sim_contacts.js for list display