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

========

https://hg.mozilla.org/integration/gaia-2_0/rev/49831714ba0d
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #24591 from yzen/bug-1071159

Bug 1071159 - fixing statusbar visibility in fullscreen app with utility...

========

https://hg.mozilla.org/integration/gaia-2_0/rev/0085c171e0b2
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1071159 - fixing statusbar visibility in fullscreen app with utility tray.
Bumping manifests a=b2g-bump