Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_4/rev/664dc60607eb
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #17555 from shamenchens/Bug984834-Video-Playback

Bug984834 Video Playback workaround patch, r=johnhu
Bumping manifests a=b2g-bump