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

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https://hg.mozilla.org/integration/gaia-central/rev/6ebb049d6375
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #16382 from cctuan/968661

Bug 968661 - Extract new build module webapp-shared.js from webapp-zip.j...

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https://hg.mozilla.org/integration/gaia-central/rev/98162042ae73
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 968661 - Extract new build module webapp-shared.js from webapp-zip.js

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "4c6376fe6fab7c6871d37fe173faea5785427ecd", 
+    "revision": "6ebb049d637542e37140439b5b5f97eee20be515", 
     "repo_path": "/integration/gaia-central"
 }