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

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https://hg.mozilla.org/integration/gaia-central/rev/434c903e1bbc
Author: viorelaioia <viorelaioia@gmail.com>
Desc: Merge pull request #20295 from davehunt/bug1023199

Bug 1023199 - Improve gallery flick test

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https://hg.mozilla.org/integration/gaia-central/rev/e993a1086421
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1023199 - Improve gallery flick test. r=vioia
Bumping manifests a=b2g-bump