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

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https://hg.mozilla.org/integration/gaia-central/rev/c0896df7e6dd
Author: Martijn <martijn.martijn@gmail.com>
Desc: Merge pull request #29834 from mwargers/teardown2

Bug 1150009 - Add cleanup functions to the gaia UI tests that install we...

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https://hg.mozilla.org/integration/gaia-central/rev/4dd89ae5e0e4
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1150009 - Add cleanup functions to the gaia UI tests that install webapps, part 2

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "81136a63b7cb5a303eacccc5b1e03dbf6fb1001d", 
+        "git_revision": "252c00ce153bf6d635ca56cde63fc5555090b3dd", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "abf38b84f48acd1f595e7e4295f5d7fa89be0d57", 
+    "revision": "c0896df7e6dddb3e03bfc4d2dfaff2367eb18125", 
     "repo_path": "integration/gaia-central"
 }