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

========

https://hg.mozilla.org/integration/gaia-central/rev/f4b852465f55
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #24649 from alivedise/bugzilla/1055299_master/v6

Bug 1055299: Ignore continuous app launch request in homescreen side and...r=kgrandon

========

https://hg.mozilla.org/integration/gaia-central/rev/19ad9bd36b72
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1055299: Ignore continuous app launch request in homescreen side and send homescreen to background while rocketbar is open in system side

Conflicts:
	shared/elements/gaia_grid/js/grid_view.js
Bumping manifests a=b2g-bump