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

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https://hg.mozilla.org/integration/gaia-central/rev/1663b37b74c7
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #24824 from jmcanterafonseca/fix_multi_global

Bug 1039465 - [Contacts DataRefactor] Tweak global_contacts_data module ...

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https://hg.mozilla.org/integration/gaia-central/rev/f56fce8f5d36
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1039465 - [Contacts DataRefactor] Tweak global_contacts_data module and multi_contact

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https://hg.mozilla.org/integration/gaia-central/rev/8d8fbb3f7ee3
Author: viorelaioia <viorela.ioia@softvision.ro>
Desc: Merge pull request #24884 from bebef1987/email_notification

Bug 1075510 - Add test to verify the Notification for E-mail is displaye...

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https://hg.mozilla.org/integration/gaia-central/rev/4fda481fc43a
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 1075510 - Add test to verify the Notification for E-mail is displayed r=geo

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "f1409654ab927db5c7e172e1f840976af0ee2390", 
+    "revision": "1663b37b74c7a7480072caf8cf1e4922c8c1e29e", 
     "repo_path": "/integration/gaia-central"
 }