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

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https://hg.mozilla.org/integration/gaia-central/rev/9984b271203d
Author: autolander <kgrandon@mozilla.com>
Desc: Bug 1103589 - merge pull request #26425 from KevinGrandon:bug_1103589_private_browser_new_window to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/41a3c1896279
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1103589 - Support window.open calls from a private browser r=gduan
Bumping manifests a=b2g-bump