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

========

https://hg.mozilla.org/integration/gaia-central/rev/f8248c26e183
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #13762 from eeejay/bug-938931

Bug 938931 - [FTU] Fix checkbox regressions from bug #914892. r=fcampo

========

https://hg.mozilla.org/integration/gaia-central/rev/72a863401491
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 938931 - [FTU] Fix checkbox regressions from bug #914892

========

https://hg.mozilla.org/integration/gaia-central/rev/b29331057651
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #13782 from pivanov/bug-939148

Bug 939148 - [Action Icons - Calendar] Remove shadows from action icons r=kgrandon

========

https://hg.mozilla.org/integration/gaia-central/rev/bbd669bcf8f3
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 939148 - [Action Icons - Calendar] Remove shadows from action icons

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "0fdf18443d5cbbf3528468b3516dd50f434c8bbf", 
+    "revision": "f8248c26e18303d76c6fc9d8020063477fdd446b", 
     "repo_path": "/integration/gaia-central"
 }