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

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https://hg.mozilla.org/integration/gaia-central/rev/fe285cd5f517
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1149100 - merge pull request #29218 from Cwiiis:bug1149100-group-collapse-offset-regression to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/8028c8b53a86
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1149100 - Fix collapsed icon offset regression. r=kgrandon

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "5c546a319e22e1e0b20608cd82069a8aeb05d5ca", 
+        "git_revision": "6e9bac2de1c24fc7700ce6115f982051666061e6", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "c1284c8056d4dc69c95a74f537b61d5bb9d3b866", 
+    "revision": "fe285cd5f517f5c716296a080aa5dde0d4c4b45a", 
     "repo_path": "integration/gaia-central"
 }