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

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https://hg.mozilla.org/integration/gaia-central/rev/b3e578bc32ce
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #11792 from lodr/bug-906756-changing-algorithms

Bug 906756 - Algorithms for merging givenName and familyName changed.
r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/872fb0e0a347
Author: lodr <salva@unoyunodiez.com>
Desc: Bug 906756 - Algorithms for merging givenName and familyName changed.
New tests added.
Adapt and merge changed to allow specifying the master contact.
Name composition centralized to avoid code repetition.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "9d9dfbc39ce6220429afacc4302dae1fe7c4ec47", 
+    "revision": "b3e578bc32cefba0e0ee997a945898a7c7b9024d", 
     "repo_path": "/integration/gaia-central"
 }