Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/270dd5504023
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #18367 from RudyLu/keyboard/Bug993952-squash

Bug 993952 - Position inactive keyboards off screen instead of display: ...
r=rudylu

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https://hg.mozilla.org/integration/gaia-central/rev/ef02adbe8911
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 993952 - Position inactive keyboards off screen instead of display: none
 - Move panels fully out of viewport

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https://hg.mozilla.org/integration/gaia-central/rev/f47d9872c964
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #18258 from Rik/remove-non-promise-995630

Bug 995630 - Remove Gaia code that supported the old mozTelephony.dial/d... r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/435ac498602b
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 995630 - Remove Gaia code that supported the old mozTelephony.dial/dialEmergency API

- Removed requireApp usage
- Moved the telephony.dial/dialEmergency stubbing to the main suite
- Some modifications for jshint compat
Bumping manifests a=b2g-bump