Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4ef3bb9036f4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #14945 from KevinGrandon/refix_bug_938033

Bug 938033 - Fix commit message

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https://hg.mozilla.org/integration/gaia-central/rev/8da12c7d7190
Author: varada.sireesha <varada.sireesha@lge.com>
Desc: Bug 938033 - file is not recognized by video, but it can be played through transfered by bluetooth r=johnhu

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https://hg.mozilla.org/integration/gaia-central/rev/a09269ff2029
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Indentation is corrected"

This reverts commit 4649435687309f07b851aca20d25d3c6f3a67360.