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

========

https://hg.mozilla.org/integration/gaia-central/rev/8c90311886ca
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1068880 - merge pull request #28640 from yzen:bug-1068880 to mozilla-b2g:master

========

https://hg.mozilla.org/integration/gaia-central/rev/2580234337d7
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1068880 - imporeved accessibility around camera settings UI. r=justindarc

========

https://hg.mozilla.org/integration/gaia-central/rev/d0be5da51f0f
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1138147 - merge pull request #28636 from etiennesegonzac:bug-1138147 to mozilla-b2g:master

========

https://hg.mozilla.org/integration/gaia-central/rev/5a16c2ed8ab1
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1138147 - Prevent fuzzing from triggering events in the current app when taping the SHB background. r=gmarty

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "5800b7e2d088f0f39f1d0bc4ada99426ca7521bb", 
+        "git_revision": "d08bb1fcf1373657a79269d34bb6d61ad1cd6c45", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "10f2f3ddc3f74c2db38f46b041bb52467cb504a3", 
+    "revision": "8c90311886ca0f9c8621d0ea4c620e6f794c59e3", 
     "repo_path": "integration/gaia-central"
 }