Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/9cde9c357524
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13618 from viorelaioia/bug_937344_v1.2

[v1.2] Bug 937344 - Replace get_all_video files in test_camera_capture_video with video_files property

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https://hg.mozilla.org/integration/gaia-1_2/rev/d7f28b459e97
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: [v1.2] Bug 937344 - Replace get_all_video files in test_camera_capture_video with video_files property