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

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https://hg.mozilla.org/integration/gaia-central/rev/7877554f8f6c
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #13651 from soumyakanti/Bug_937004

Bug 937004 - Part II, remove Remove l10-id keyboardLayouts.
r=rudylu

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https://hg.mozilla.org/integration/gaia-central/rev/e42f752918fa
Author: Soumya Kanti Chakraborty <soumyakanti.chakraborty@gmail.com>
Desc: Remove l10-id keyboardLayouts