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

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https://hg.mozilla.org/integration/gaia-central/rev/0a952f9abd4d
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #13596 from wilsonpage/css

Bug 937385 - [Camera] CSS Refactoring

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https://hg.mozilla.org/integration/gaia-central/rev/6d74df5473d5
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 937385 - [Camera] CSS Refactoring