Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/cf8568d3dba4
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #22339 from huchengtw-moz/system-bug-1044735

Bug 1044735 - homescreenLauncher and lockScreenNotifications is undefine..., r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/d56ce36d1f38
Author: John Hu <im@john.hu>
Desc: Bug 1044735 - homescreenLauncher and lockScreenNotifications is undefined while reloading in Nightly

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https://hg.mozilla.org/integration/gaia-central/rev/e0a043f45a01
Author: pacorampas <b.frv@tid.es>
Desc: Merge pull request #22345 from pacorampas/layout

Bug 1033230 - create a new Layout css file in the shared directory r=arnau

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https://hg.mozilla.org/integration/gaia-central/rev/30e547a9136e
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1033230 - create a new Layout css file in the shared directory
Bumping manifests a=b2g-bump