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

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https://hg.mozilla.org/integration/gaia-central/rev/175311ccd332
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #20378 from justindarc/bug1015385

Bug 1015385 - [Camera] Implement new startup loading events

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https://hg.mozilla.org/integration/gaia-central/rev/3e868ef7f199
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1015385 - [Camera] Implement new startup loading events
Bumping manifests a=b2g-bump