Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b616aa39e537
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #22896 from benfrancis/1053936

Bug 1053936 - Add hit states to browser chrome buttons r=cwiiis

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https://hg.mozilla.org/integration/gaia-central/rev/66fea35fe3d8
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 1053936 - Add hit states to browser chrome buttons

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https://hg.mozilla.org/integration/gaia-central/rev/83cb89331d8f
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #22633 from wilsonpage/1015294

Bug 1015294 - [Homescreen] Update to use gaia-header

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https://hg.mozilla.org/integration/gaia-central/rev/04ed5a73b1cc
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1015294 - [Homescreen] Update to use gaia-header

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https://hg.mozilla.org/integration/gaia-central/rev/b0b25be8f3e4
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #22636 from wilsonpage/1050404

Bug 1050404 - [Collections] Update to use gaia-header

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https://hg.mozilla.org/integration/gaia-central/rev/9031364b6a60
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1050404 - [Collections] Update to use gaia-header
Bumping manifests a=b2g-bump