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

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https://hg.mozilla.org/integration/gaia-central/rev/0928af6ba801
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1111871 - merge pull request #26853 from etiennesegonzac:bug-1111871 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/7c31adeeb72e
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1111871 - Properly exiting the tabs view on lock events. r=sfoster
Bumping manifests a=b2g-bump