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

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https://hg.mozilla.org/integration/gaia-central/rev/53587f63610d
Author: Yuren Ju <yurenju@gmail.com>
Desc: Revert "Bug 922463 - Part 1: rewrite build/multilocale.py in javascript"

This reverts commit 43c7463d99e072c5d7d74a73a125a7bb3a8da329.

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https://hg.mozilla.org/integration/gaia-central/rev/5644f4d1a5ee
Author: Yuren Ju <yurenju@gmail.com>
Desc: Revert "Bug 922463 - Part 2: Modified httpd extension for multilocale.js"

This reverts commit bb7d576483f16e2ac76e6303279a6098c0333212.