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

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https://hg.mozilla.org/integration/gaia-central/rev/b4d0de534a22
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19213 from KevinGrandon/bug_989394_contacts_form_test_intermittent

Bug 989394 - Intermittent failing test: Contacts > Form Click phone number Can create custom label

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https://hg.mozilla.org/integration/gaia-central/rev/aadcc84185a1
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 989394 - Intermittent failing test: Contacts > Form Click phone number Can create custom label r=jmcf

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "dfef5388da07e05f3df98c61deeecb7a07e8bd19", 
+    "revision": "b4d0de534a22352c1551c5fbb7f23f159fb343ae", 
     "repo_path": "/integration/gaia-central"
 }