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

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https://hg.mozilla.org/integration/gaia-central/rev/b4ad6c153e80
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #23901 from azasypkin/bug-1058459-share-drafts

Bug 1058459 - [SMS] Data shared from other applications are not shown as Drafts until the app is killed and open again.  r=schung

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https://hg.mozilla.org/integration/gaia-central/rev/047fab1e5724
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1058459 - [SMS] Data shared from other applications are not shown as Drafts until the app is killed and open again. Using SharedWorker as inter app communication bus. r=schung

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "f120e79a6735573f98b7a121e350cf01bcd855d3", 
+    "revision": "b4ad6c153e80752fbc5dae6ea66cc2178173832d", 
     "repo_path": "/integration/gaia-central"
 }