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/e8c4995293e1
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #14334 from huchengtw-moz/video/bug_938967-v1.2

Merge pull request #13824 from huchengtw-moz/video/Bug_938967_00-00_is_n...

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https://hg.mozilla.org/integration/gaia-1_2/rev/a5573baa1294
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #13824 from huchengtw-moz/video/Bug_938967_00-00_is_not_handle_correctly

Bug 938967 - [fugu][hamachi]The video had be sought to 00:00 could not b..., r=djf
(cherry picked from commit fe33351a4a460172212ad234b1a98ba2dcd29ac4)

Conflicts:
	apps/video/js/video.js