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

========

https://hg.mozilla.org/integration/gaia-central/rev/1ed796554f9d
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1136346 - merge pull request #28528 from martasect:Bug_1136346 to mozilla-b2g:master

========

https://hg.mozilla.org/integration/gaia-central/rev/3172c90ca082
Author: Marta Piekarska <marta@sec.t-labs.tu-berlin.de>
Desc: Bug 1136346 - 'Custom location' header is not consistent with other header capitalization; location is not capitalized

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "53e27eadf42dfac6c7fc9fbe70ab3d453a1eb66a", 
+        "git_revision": "8db63896a36f0bf31afe3f2b7c45af19c1b91355", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "165f330e737858c9de54262b55774b58dd1ec909", 
+    "revision": "1ed796554f9d0d1336a125030036d5795866beca", 
     "repo_path": "integration/gaia-central"
 }