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

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https://hg.mozilla.org/integration/gaia-central/rev/1e7dcea5e0b5
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #15010 from mcav/downloadbodyreps-idempotent

Bug 912825 - [email] Message reader appears to duplicate body contents when buildBodyDom is called multiple times. r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/a24b98ec4286
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 912825 - [email] Message reader appears to duplicate body contents when buildBodyDom is called multiple times. r=asuth