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

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https://hg.mozilla.org/integration/gaia-central/rev/30967c019132
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #16937 from viorelaioia/geoloc

test geolocation failure

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https://hg.mozilla.org/integration/gaia-central/rev/1c53e7a37a53
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: test geolocation failure

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https://hg.mozilla.org/integration/gaia-central/rev/20cd238a6b66
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #16922 from mikehenrty/bug-965732-backbutton

Bug 965732 - [DSDS][FTE] Incorrect Order in screens in FTE when user pre... r=francisco

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https://hg.mozilla.org/integration/gaia-central/rev/4dbe6406fd1a
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 965732 - [DSDS][FTE] Incorrect Order in screens in FTE when user presses "Back" button
Bumping manifests a=b2g-bump