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

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https://hg.mozilla.org/integration/gaia-central/rev/70eeaa702869
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #11978 from alivedise/bugzilla/905116_master_v3/implement-homescreen-window-launcher

Bug 905116 - Implement Homescreen Window + Homescreen Launcher, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/0cef61b4b186
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 905116 - Implement Homescreen Window + Homescreen Launcher