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

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https://hg.mozilla.org/integration/gaia-central/rev/3e51a3bc3dd6
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #22886 from etiennesegonzac/bug-1047660

Bug 1047660 - Making the software home button and the edge gestures play nice in landscape r=21

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https://hg.mozilla.org/integration/gaia-central/rev/26b1aeec609a
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1047660 - Making the software home button and the edge gestures play nice in landscape.
Bumping manifests a=b2g-bump