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

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https://hg.mozilla.org/integration/gaia-central/rev/ff441a0d4a18
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #13215 from soumyakanti/solution_bug_930165

Bug 930165 - Fix translation of Fixed dialling numbers, r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/79f530abd5ab
Author: Soumya Kanti Chakraborty <soumyakanti.chakraborty@gmail.com>
Desc: Bug 930165 - Fix translation of Fixed dialling numbers across the locales

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https://hg.mozilla.org/integration/gaia-central/rev/a10480e71313
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #13122 from pivanov/bug-917860

Bug 917860 - [System] Use Full Line Highlights in notifications, r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/afe33eb9b8ce
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 917860 - [System] Use Full Line Highlights in notifications

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "207a81a6816b8627674a956b521772de2ac6b572", 
+    "revision": "ff441a0d4a1834ce864ff8cc124ad13af2d08212", 
     "repo_path": "/integration/gaia-central"
 }