Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/2adce4f197e3
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #22576 from Cwiiis/bug1048927-add-web-to-home-screen

Bug 1048927 - Enable 'add to home' for all web content. r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/49a25a867a13
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1048927 - Use button.disabled in app chrome. r=vingtetun

Stop using data-disabled unnecessarily for button elements.

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https://hg.mozilla.org/integration/gaia-central/rev/1b87fa3e6b01
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1048927 - Enable 'add to home' for all web content. r=vingtetun

This enables the 'add to home' option for all web content and not just
e.me results.
Bumping manifests a=b2g-bump