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

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https://hg.mozilla.org/integration/gaia-central/rev/81b9711ad71e
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #12612 from gtorodelvalle/contacts-bug-922711-matching-email-addresses-not-highlighted

Contacts bug 922711 matching email addresses not highlighted

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https://hg.mozilla.org/integration/gaia-central/rev/4eaa05a3866f
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 922711 - [Contacts] Matching contacts email addresses are not highlighted in the matching details overlay.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "b18d7bedcb94efbf84431e8f0e13826660df4a0c", 
+    "revision": "81b9711ad71e80b379dab8b2e78c5c02547fa423", 
     "repo_path": "/integration/gaia-central"
 }