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

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https://hg.mozilla.org/integration/gaia-central/rev/b4c0c51f9e2f
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #25352 from lightsofapollo/bug-1080231

Update gaia_node_modules to latest tbpl reporter

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https://hg.mozilla.org/integration/gaia-central/rev/62f0dae749dd
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 1080231 - Update gaia_node_modules to latest tbpl reporter r=me

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "fde1b2fb340a7092e22a4d41d7ebc4fe552f6548", 
+    "revision": "b4c0c51f9e2f7ddd4e174c9b66bfe4e9d8773811", 
     "repo_path": "/integration/gaia-central"
 }