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

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https://hg.mozilla.org/integration/gaia-central/rev/e7709a5709e4
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #16497 from snowmantw/issue963010

Bug 963010 - [NFC] When shrinking UI showed up, it will be strange when clicked on home button

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https://hg.mozilla.org/integration/gaia-central/rev/8ad9ff6e9a59
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 963010 - [NFC] When shrinking UI showed up, it will be strange when clicked on home button
Bumping manifests a=b2g-bump