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

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https://hg.mozilla.org/integration/gaia-central/rev/599a89551bb6
Author: viorelaioia <viorelaioia@gmail.com>
Desc: Merge pull request #22074 from bebef1987/investigate_video

Bug 1024517 - [Flame] Investigate Video app test failures

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https://hg.mozilla.org/integration/gaia-central/rev/9d6d165552e1
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 1024517 - [Flame] Investigate Video app test failures
Bumping manifests a=b2g-bump