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/4e86dc2ad34b
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #14620 from davidflanagan/bug946803-v1.2

Merge pull request #14435 from huchengtw-moz/camera/Bug_946803_transform...

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https://hg.mozilla.org/integration/gaia-1_2/rev/d3e3d5cd838f
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #14435 from huchengtw-moz/camera/Bug_946803_transform-origin

Bug 946803 - [B2G][Camera] After user opens new photo from thumbnail in ..., r=djf(cherry picked from commit 06386175236ae1618663163849343172668dbdec)