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

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https://hg.mozilla.org/integration/gaia-central/rev/4b1e22bb3006
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #11793 from mcav/reply-menu-bug-802944

 Bug 802944 - Reply button should popup select menu for deciding reply mode instead of listing all the reply mode button in title. r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/ac01d808e2a2
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 802944 - Reply button should popup select menu for deciding reply mode instead of listing all the reply mode button in title r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/02f00aec88ac
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #11868 from KevinGrandon/bug_910975_update_shelljs

Bug 910975 - Update shell.js webapps event r=fabrice

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https://hg.mozilla.org/integration/gaia-central/rev/d5b391279461
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 910975 - Update shell.js webapps event