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

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https://hg.mozilla.org/integration/gaia-central/rev/a815ebbbe084
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #10974 from jmcanterafonseca/contacts_matcher_v1

Bug 889756 - Design and implement a ContactsMatcher module

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https://hg.mozilla.org/integration/gaia-central/rev/763808ee9b75
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 889756 - Design and implement a ContactsMatcher module
Bug 874754 - Suppress nsIEditor.removeEditorObserver exception. r=fabrice

Based on patch from Yuan Xulei <xyuan@mozilla.com>

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extra : rebase_source : 77b563eaa784d42cdfd20a3aba1f5b928a53aaa6