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

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https://hg.mozilla.org/integration/gaia-central/rev/db856ad3367d
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #19447 from kamituel/Bug_1006754

Bug 1006754: NDEFUtils unit tests and minor refactor

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https://hg.mozilla.org/integration/gaia-central/rev/2350f75e3cbb
Author: Kamil Leszczuk <kamituel@gmail.com>
Desc: Bug 1006754: NDEFUtils unit tests and minor refactor.
Bumping manifests a=b2g-bump