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

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https://hg.mozilla.org/integration/gaia-central/rev/f9d332bf8d16
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22902 from KevinGrandon/bug_1047645_app_window_miss_transition

Bug 1047645 - Use manual timeout to guard _closed event from not firing

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https://hg.mozilla.org/integration/gaia-central/rev/ff972ac0c0c0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1047645 - Use manual timeout to guard _closed event from not firing r=alive
Bumping manifests a=b2g-bump