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

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https://hg.mozilla.org/integration/gaia-central/rev/e240516ce3ec
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #11348 from epang/bug901496_browsergraphicswap

Bug 901499 - Swap Camera Graphics r=samjoch

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https://hg.mozilla.org/integration/gaia-central/rev/44bde2c73c65
Author: Eric Pang <epang@mozilla.com>
Desc: Bug 901499 - Swap Camera Graphics