Bumping gaia.json for 6 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3fe3807bdfc8
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #13450 from kinetiknz/bug927852

Bug 927852 - Use Web Audio rather than deprecated Audio Data API in dialer and emergency dialer. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/a443998488c2
Author: Matthew Gregan <kinetik@flim.org>
Desc: Bug 927852 - Use Web Audio rather than deprecated Audio Data API in dialer and emergency dialer.

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https://hg.mozilla.org/integration/gaia-central/rev/0f255f9be235
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #13398 from EverythingMe/933592-evme-placeholder

Bug 933592 - The composition string is overlapped with the "I'm thinking...

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https://hg.mozilla.org/integration/gaia-central/rev/95cecff60472
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 933592 - The composition string is overlapped with the "I'm thinking of..." string in the search box of everything.me [r=ranbena, evyatron]

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https://hg.mozilla.org/integration/gaia-central/rev/a8b3ed479062
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13447 from stupchiy/bug_935440

Bug 935440 - Fix my mistake in test_geolocation_prompt.py

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https://hg.mozilla.org/integration/gaia-central/rev/90f0f306bfdc
Author: Sergey Tupchiy <tupchii.sergii@gmail.com>
Desc: Bug 935440 - Fix my mistake in test_geolocation_prompt.py