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

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https://hg.mozilla.org/integration/gaia-central/rev/d7e815eb184c
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #26596 from jrburke/bug1106888-email-clear-cache

Bug 1106888 - [email] Clear cookie cache once account creation starts r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/81d78563004e
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1106888 - [email] Clear cookie cache once account creation starts
Bumping manifests a=b2g-bump