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

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https://hg.mozilla.org/integration/gaia-central/rev/46e5403b509a
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #16063 from davidflanagan/bug942199

Bug 942199: Allow minimum EXIF preview size to be configured at build ti...

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https://hg.mozilla.org/integration/gaia-central/rev/c266b6e2ea0d
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 942199: Allow minimum EXIF preview size to be configured at build time for Camera and Gallery
(cherry picked from commit e439f8630fdea790595efaebab24ec21be6bc0e4)

Conflicts:

	apps/camera/js/filmstrip.js
Bumping manifests a=b2g-bump