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

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https://hg.mozilla.org/integration/gaia-central/rev/cb6a95abbbfc
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #12200 from comoyo/support-switch2

Bug 912951 - Send content event from gaia -> chrome with layout info for supportsSwitching. r=RudyL

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https://hg.mozilla.org/integration/gaia-central/rev/7ee066f7051c
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 912951 - Send content event from gaia -> chrome with layout info for supportsSwitching