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

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https://hg.mozilla.org/integration/gaia-central/rev/f3798cf6c29f
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #19907 from etiennesegonzac/bug-1018590

Bug 1018590 - Properly remove the input focus when hiding the keyboard. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/2efc011a6fc6
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1018590 - Properly remove the input focus when hiding the keyboard.
Bumping manifests a=b2g-bump