Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/afa9770941f7
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1131070 - merge pull request #28689 from JohanLorenzo:bug-1131070 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/300fab35160f
Author: Johan Lorenzo <jlorenzo@mozilla.com>
Desc: Bug 1131070 - Investigate test_toggle_airplane_mode intermittent failure

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https://hg.mozilla.org/integration/gaia-central/rev/2f21373afc20
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1137766 - merge pull request #28687 from JohanLorenzo:bug-1137766 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/dc54eded919e
Author: Johan Lorenzo <jlorenzo@mozilla.com>
Desc: Bug 1137766 - test_settings_change_language.py error; exception "Element '%s' could not be foundin select wrapper"

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "4c38360375ae2692ffc4e644bd3f56a2bf58c002", 
+        "git_revision": "25b82a271cab14555130b117b121f811f9a3c2ac", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "1d3c89be273f2d57144b4a9e61e708f0255e4bdc", 
+    "revision": "afa9770941f733a78580624798b507aff3819530", 
     "repo_path": "integration/gaia-central"
 }