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

========

https://hg.mozilla.org/integration/gaia-central/rev/7a7aa6275179
Author: dwi2 <dwi2@dwi2.com>
Desc: Merge pull request #19231 from dwi2/bug1010092

Bug 1010092 - [Stingray] replace origin variable as manifestURL in layou...

========

https://hg.mozilla.org/integration/gaia-central/rev/be24ef07934c
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1010092 - [Stingray] replace origin variable as manifestURL in layout editor
Bumping manifests a=b2g-bump