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

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https://hg.mozilla.org/integration/gaia-central/rev/091d8adce0fd
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #22821 from cctuan/1053054

Bug 1053054 - ShrinkingUI should be instantiable

========

https://hg.mozilla.org/integration/gaia-central/rev/75a0de7d7b9e
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1053054 - ShrinkingUI should be instantiable

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "5574ba38d87128480049442edfa2c056404b45f2", 
+    "revision": "091d8adce0fd802f3a4ef5b2b67bff67dc882b44", 
     "repo_path": "/integration/gaia-central"
 }