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

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https://hg.mozilla.org/integration/gaia-central/rev/6b47496c2c45
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #13654 from steveck-chung/message-information-page

Bug 933131 - Message report panel implementation. r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/5ab5e32f188a
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 933131 - Message report panel implementation