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

========

https://hg.mozilla.org/integration/gaia-central/rev/ac20ee9006bb
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #31920 from sroucheray/1037620-late-arrival-notice

Bug 1037620 - Late Arrival Notice in Messages App. r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/9fb7f27dfb38
Author: sroucheray <stephane.roucheray@gmail.com>
Desc: Bug 1037620 - Late Arrival Notice in Messages App r=julien

In SMS app :
Add a humanized lateness (diff between sent and received time) notice in the bubbles of conversation view
Add a humanized lateness message in report view

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "df7683e4f7329c567deb487d11317578c6930246", 
+        "git_revision": "18fca1ea74e7a41049e7d44bebecbc6a8876896d", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "f228e30f97290c71151b622ae44190dd300f26b8", 
+    "revision": "ac20ee9006bb3ae559bf09a2145d73f2f4fc79f5", 
     "repo_path": "integration/gaia-central"
 }