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

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https://hg.mozilla.org/integration/gaia-central/rev/9a9c7a559a26
Author: Dave Hylands <dhylands@gmail.com>
Desc: Merge pull request #10949 from dhylands/bug-893120-mochitest-perms

Bug 893120 - Fix devicestorage permissions for mochitest. r=dclarke

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https://hg.mozilla.org/integration/gaia-central/rev/9ac658beb8a3
Author: Dave Hylands <dhylands@gmail.com>
Desc: Bug 893120 - Fix devicestorage permissions for mochitest.