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

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https://hg.mozilla.org/integration/gaia-central/rev/9079aed1a902
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #18030 from daleharvey/991787

Bug 991377 - Use button tag for footer buttons. r=benfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/d1dff8120cb7
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 991377 - Use button tag for footer buttons. r=benfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/df2766b99800
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #18002 from rsajdok/bug#909201b

Bug 909201: Editing names doesn't update properly r=bkelly

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https://hg.mozilla.org/integration/gaia-central/rev/70e0dceae113
Author: Robert Sajdok <robert.sajdok@gmail.com>
Desc: Bug 909201: Editing names doesn't update properly
Bumping manifests a=b2g-bump