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

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https://hg.mozilla.org/integration/gaia-central/rev/aed61c4d507f
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #20048 from snowmantw/issue1020728

Bug 1020728 - [System] Pre-launching LockScreen while the screen off

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https://hg.mozilla.org/integration/gaia-central/rev/648a92bbf59e
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1020728 - [System] Pre-launching LockScreen while the screen off
Bumping manifests a=b2g-bump