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

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https://hg.mozilla.org/integration/gaia-central/rev/4cf9b07dbfc5
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #19201 from anvk/bug1009397

Bug 1009397: Removing /apps/*/shared from .gitignore r=@yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/9181da27bca3
Author: Alexey Novak <alexey.novak.mail@gmail.com>
Desc: Bug 1009397: Removing /apps/*/shared from .gitignore

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "0550bfc36dcc4997a4213413500397cd01c4ca8c", 
+    "revision": "4cf9b07dbfc5c1b97dc56b7cf4eeef3ab9f26244", 
     "repo_path": "/integration/gaia-central"
 }