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

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https://hg.mozilla.org/integration/gaia-central/rev/494467b3c443
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #11434 from etiennesegonzac/oncall-split-and-test

Bug 902983 - Split oncall.js and make it testable r=Rik

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https://hg.mozilla.org/integration/gaia-central/rev/c5e1f2148a89
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 902983 - Split oncall.js and make it testable
r=Rik
Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/aab0a2027f9e
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Merge pull request #11274 from JonHylands/jhylands-899123-add-contact-pics-master

Bug 899123 - add pictures to contact reference workloads

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https://hg.mozilla.org/integration/gaia-central/rev/49a58a560acb
Author: Jon Hylands <jhylands@mozilla.com>
Desc: Bug 899123 - add pictures to contact reference workloads