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

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https://hg.mozilla.org/integration/gaia-central/rev/d10688f3f50d
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #11710 from lightsofapollo/fix-emails-build-system

Bug 908580 - Update xulrunner-sdk path for email apps r=me a=bustage

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https://hg.mozilla.org/integration/gaia-central/rev/85b7a4ea3e25
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 908580 - Update xulrunner-sdk path for email apps r=me a=bustage