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

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https://hg.mozilla.org/integration/gaia-central/rev/353644a8ef16
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #22958 from cctuan/1020802

Bug 1020802 - [Text Selection] Hide utility bubble when user dragging the selectioncarets handle

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https://hg.mozilla.org/integration/gaia-central/rev/66a6493b19af
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1020802 - [Text Selection] Hide utility bubble when user dragging the selectioncarets handle
Bumping manifests a=b2g-bump