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

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https://hg.mozilla.org/integration/gaia-central/rev/1e3fa6fe4ab9
Author: Justin Lebar <justin.lebar@gmail.com>
Desc: Merge pull request #11236 from jlebar/apploaded-listener

Bug 899328 - Register only one listener for mozbrowserloadend and appload...

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https://hg.mozilla.org/integration/gaia-central/rev/836f32732fee
Author: Justin Lebar <justin.lebar@gmail.com>
Desc: Bug 899328 - Register only one listener for mozbrowserloadend and appopen on a given app iframe.

This prevents us from leaking listeners.