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

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https://hg.mozilla.org/integration/gaia-central/rev/4b9b57bf722c
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #23268 from pivanov/bug-1035676

Bug 1035676 - [Costcontrol] - check missing images

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https://hg.mozilla.org/integration/gaia-central/rev/99a3d6fa1450
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1035676 - [Costcontrol] - check missing images

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https://hg.mozilla.org/integration/gaia-central/rev/764daca0890d
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #23307 from Moz-TedC/bug1058362-fix

Bug 1058362 - Fix failing gaia integration tests. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/bd0b29766057
Author: Ted Clancy (:tedders1) <tclancy@mozilla.com>
Desc: Bug 1058362 - Fix failing gaia integration tests.
Bumping manifests a=b2g-bump