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

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https://hg.mozilla.org/integration/gaia-central/rev/0f31fd2198cd
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #24352 from KevinGrandon/bug_1071707_homescreen_marionette_test_browser_dep

Bug 1071707 - Remove browser dependency from marionette tests

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https://hg.mozilla.org/integration/gaia-central/rev/0b2e95da1d53
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1071707 - Remove browser dependency from marionette tests r=Cwiiis
Bumping manifests a=b2g-bump