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

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https://hg.mozilla.org/integration/gaia-central/rev/b9883321a4fc
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #19278 from ranjithgithub/1000701_FileNameDoneIconSupport

Bug 1000701-File name & Done icon support, r=johnhu

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https://hg.mozilla.org/integration/gaia-central/rev/8798d6bca1e1
Author: ranjith.gutha <ranjith.gutha@lge.com>
Desc: Bug 1000701-File name & Done icon support

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "a1e288daa17c774c9680058ffb661da7d463bdb1", 
+    "revision": "b9883321a4fc93fc7262abad2419e710d64cab6c", 
     "repo_path": "/integration/gaia-central"
 }