Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f3af2b225255
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 932271 - Reset context menu state at the correct moment. r=daleharvey

Displaying the context menu in the browser app is controlled by a
barrier. We have to make sure that this barrier is correctly reset at
the right time to ensure that the context menu will work more than once:
setting the state before doing the callback is safer than relying on the
callback to handle it by itself.