Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/252de6684158
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #14054 from crh0716/943260

Bug 943260 - Initialize status bar only once r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/c1b34e349a4d
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 943260 - Initialize status bar only once

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https://hg.mozilla.org/integration/gaia-central/rev/59c66e2cb3ac
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #14060 from dominickuo/revert-bug-911108

Revert "Merge pull request #13997 from dominickuo/bug-911108"

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https://hg.mozilla.org/integration/gaia-central/rev/3cd59b64255c
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Revert "Merge pull request #13997 from dominickuo/bug-911108"

This reverts commit f830cdeb9931abf487a535085701137fb2e9892e, reversing
changes made to 0904f366263eca59f61afb9c340004f91e488870.