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

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https://hg.mozilla.org/integration/gaia-central/rev/c337a87fb03f
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13481 from bobsilverberg/bug935061

Bug 935061 - Re-enable test_play_ogg_video.py

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https://hg.mozilla.org/integration/gaia-central/rev/5744a8329742
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 935061 - Re-enable test_play_ogg_video.py