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

========

https://hg.mozilla.org/integration/gaia-central/rev/8fe940fe082f
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1132929 - merge pull request #28217 from yzen:bug-1132929 to mozilla-b2g:master

========

https://hg.mozilla.org/integration/gaia-central/rev/a51be13b206c
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1132929 - [Accessibility] fixing visibility issues around Video app.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "8d4a1ea361ecc162a0d3fba8632e890aab3f2e00", 
+        "git_revision": "9d8328af216c94f4dbdab8949240b44bae47852a", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "5f5dec35f752140b1f45da0c40d025018e372e1c", 
+    "revision": "8fe940fe082f65d33a25190c7585f010c2d3f9a3", 
     "repo_path": "integration/gaia-central"
 }