Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8c7b07c8b0c3
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: Bug 958103 - [Messages][Drafts] Don't auto-save drafts when message input is empty

https://bugzilla.mozilla.org/show_bug.cgi?id=958103
Signed-off-by: Rick Waldron <waldron.rick@gmail.com>