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

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https://hg.mozilla.org/integration/gaia-central/rev/cb3ab98cbc87
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #17851 from rnowm/990528

Bug 990528 - [Messaging][Visual refresh][Regression] Adding several recipients breaks the layout r=bfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/c1281d4712ba
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 990528 - [Messaging][Visual refresh][Regression] Adding several recipients breaks the layout

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "a6cc73a4ec3641aae16bcf459c5b9e45a0142ddc", 
+    "revision": "cb3ab98cbc87e3bcb95cc5021318e87892118ef1", 
     "repo_path": "/integration/gaia-central"
 }