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

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https://hg.mozilla.org/integration/gaia-central/rev/3bfa2705ae29
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 917196 - When short tones are enabled make audible tones short too r=etienne
Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/1cdfd57c2ca0
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #13814 from jfkthame/patch-3

[bug 906273] increase height of label wrapper to avoid clipping Arabic-s...

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https://hg.mozilla.org/integration/gaia-central/rev/bef671a443bb
Author: jfkthame <jfkthame@gmail.com>
Desc: [bug 906273] increase height of label wrapper to avoid clipping Arabic-script text

This enables us to display Arabic-script labels without clipping and without disrupting the baseline position of the label text; the margin adjustments are to maintain the existing position of the text in relation to the icon, while its display box is enlarged to allow for taller glyphs to be drawn.

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https://hg.mozilla.org/integration/gaia-central/rev/2ea5424216df
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13644 from bobsilverberg/gecko_prefs

Bug 932750 - Add helper methods to GaiaData to get and set Gecko prefs

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https://hg.mozilla.org/integration/gaia-central/rev/a2a6e3c6f8c1
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 932750 - Add helper methods to GaiaData to get and set Gecko prefs