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

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https://hg.mozilla.org/integration/gaia-central/rev/d08fc44b3727
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #14281 from lightsofapollo/bug-908931

Bug 908931 - vbump mocha r=me a=test-only +shepherd

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https://hg.mozilla.org/integration/gaia-central/rev/25b687c6988b
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 908931 - vbump mocha r=me a=test-only