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

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https://hg.mozilla.org/integration/gaia-central/rev/ca50a633ddfe
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #11776 from comoyo/chrome_ev_desktop2

Bug 909686 - Allow desktop helper extensions to send chromeEvents

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https://hg.mozilla.org/integration/gaia-central/rev/d3a2e0c3b63c
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 909686 - Allow desktop helper extensions to send chromeEvents