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

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https://hg.mozilla.org/integration/gaia-central/rev/d018b97c15ed
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #15373 from wilsonpage/bug/958146

Bug 958146 - [Camera] fxos specific APIs need to be mocked in order to r...

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https://hg.mozilla.org/integration/gaia-central/rev/ab5d1af85c61
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 958146 - [Camera] fxos specific APIs need to be mocked in order to renable some of the unit tests