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

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https://hg.mozilla.org/integration/gaia-central/rev/059783eb59a9
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #12408 from lightsofapollo/unxfail-browser-stuff

Revert "Temp disable browser test until bug 919584 is fixed"

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https://hg.mozilla.org/integration/gaia-central/rev/7d0e09feb4c2
Author: James Lal <james@lightsofapollo.com>
Desc: Revert "Temp disable browser test until bug 919584 is fixed"

This reverts commit 3e248f64f8b7b4fdf6e5ecd3691e3fb4d11b8720.