Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/acfb759dfe5a
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 952098 - Add places as a rocketbar provider. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/13833975424a
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #15404 from lissyx/bug960081

Bug 960081 - Make use of shared mock Notification in Dialer call log tests r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/c010e5ae36e4
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 960081 - Make use of shared mock Notification in Dialer call log tests

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "a4c7ffc5619edd7e87fd763bd8a32291f4d394ac", 
+    "revision": "acfb759dfe5a2cbc5b1ed30fd17d47cf373deee9", 
     "repo_path": "/integration/gaia-central"
 }