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

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https://hg.mozilla.org/integration/gaia-2_0/rev/b70112577677
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #21328 from alivedise/bugzilla/1002316_v2.0

Bug 1002316 - Homescreen event should be caught by sound manager, r=timdream

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https://hg.mozilla.org/integration/gaia-2_0/rev/1345ceedf843
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1002316 - Homescreen event should be caught by sound manager
Bumping manifests a=b2g-bump