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

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https://hg.mozilla.org/integration/gaia-2_0/rev/9303cf41a0a5
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1045701 - Part 2 [Homescreen] - Do not migrated un-initialized smart collections r=amirn

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https://hg.mozilla.org/integration/gaia-2_0/rev/3dce606eb5db
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Bug 1042388 - Add back line that was accidentally removed when rebasing. a=bustage
Bumping manifests a=b2g-bump