Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/68245bd82cb2
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1074063 - Hide browser iframe on reviving

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https://hg.mozilla.org/integration/gaia-2_1/rev/a39245bf7bcf
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1089795 - [System] Layout problem with SHB in open file error dialog r=mhenretty

Conflicts:
	apps/system/test/marionette/lib/system.js

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https://hg.mozilla.org/integration/gaia-2_1/rev/5aef0eec9ece
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1088462 - [System] Adjust statusbar min width on activityopened r=etienne
Bumping manifests a=b2g-bump