Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/68029bbaabba
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #26124 from nullaus/master

Revert "Merge pull request #25589 from nullaus/bug1077595"

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https://hg.mozilla.org/integration/gaia-central/rev/f0f5c4e0e53b
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: Revert "Merge pull request #25589 from nullaus/bug1077595"

This reverts commit e9ac899aff346b2cef9be154290978fc18d1bc8f, reversing
changes made to 155f44a3063fdb7599208de9749ad487b870dd06.
Bumping manifests a=b2g-bump