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

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https://hg.mozilla.org/integration/gaia-1_4/rev/6290e67fb2fe
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17711 from chirarobert/v1.4_fix_camera_capture

Bug 985903 - Investigate test_camera_capture_video.TestCamera intermitte...

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https://hg.mozilla.org/integration/gaia-1_4/rev/5e209a1c9e4a
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 985903 - Investigate test_camera_capture_video.TestCamera intermittent fail
Bumping manifests a=b2g-bump