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

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https://hg.mozilla.org/integration/gaia-1_4/rev/d0f83ee10c82
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #17541 from justindarc/bug985077

Bug 985077 - [Camera] Unable to take picture against dark surface with flash turned off r=djf

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https://hg.mozilla.org/integration/gaia-1_4/rev/c1215015cc83
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 985077 - [Camera] Unable to take picture against dark surface with flash turned off
Bumping manifests a=b2g-bump