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

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https://hg.mozilla.org/integration/gaia-central/rev/e950c7b5b8d1
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #17567 from alivedise/bugzilla/916709_master/popup-window-v4

Bug 916709 - Implement PopupWindow (v6), r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/f383e7c9a175
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 916709 - Implement PopupWindow (v6)
Bumping manifests a=b2g-bump