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

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https://hg.mozilla.org/integration/gaia-central/rev/892e7b12856e
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #13363 from dmarcos/bug934657

Bug 934657 - [Camera] Restructuring code following model / view pattern

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https://hg.mozilla.org/integration/gaia-central/rev/2bca8bc96cdb
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 934657 - [Camera] Restructuring code following model / view pattern