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

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https://hg.mozilla.org/integration/gaia-central/rev/3ebc27a12e8c
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #24756 from jmcanterafonseca/fix_ice_backsp_button

Bug 1077087 - [Contacts] Deleting phone number does not take the contact...

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https://hg.mozilla.org/integration/gaia-central/rev/86e8092da2c2
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1077087 - [Contacts] Deleting phone number does not take the contact out of ICE contacts

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https://hg.mozilla.org/integration/gaia-central/rev/49c4a88b08a2
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #24663 from alivedise/bugzilla/1072616/attention-window-polish

Bug 1076216 - Attention indicator polish, r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/ffb448629419
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1076216 - Attention indicator polish

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "da764acb16bb9b54e666ec3b6727bc310c27ac61", 
+    "revision": "3ebc27a12e8cbe7f02016837c31532abb6033b84", 
     "repo_path": "/integration/gaia-central"
 }