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

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https://hg.mozilla.org/integration/gaia-central/rev/aab0a2027f9e
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Merge pull request #11274 from JonHylands/jhylands-899123-add-contact-pics-master

Bug 899123 - add pictures to contact reference workloads

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https://hg.mozilla.org/integration/gaia-central/rev/49a58a560acb
Author: Jon Hylands <jhylands@mozilla.com>
Desc: Bug 899123 - add pictures to contact reference workloads

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "494467b3c4432964a8c1ba3739e20af65b248d88", 
+    "revision": "aab0a2027f9e0e5475db809553287288671e4429", 
     "repo_path": "/integration/gaia-central"
 }