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

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https://hg.mozilla.org/integration/gaia-central/rev/ecb6cfba7e2c
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #10699 from lissyx/bug854785

Bug 854785 - Ensure to round seconds when updating call duration r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/5e3b3367e243
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 854785 - Ensure to round seconds when updating call duration

When computing the duration, glitches can interfere thus that the
duration computed might be a bit under the interval of 1000ms. In the
event of this case, one would see a first tick with, for example, a
call duration of 28.001 secs, and a next tick with a duration of 28.999.