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

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https://hg.mozilla.org/integration/gaia-central/rev/6848389ae79d
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #14670 from julienw/947977-fix-scroll-when-typing

Bug 947977 - [Messages] Bug 936370 regressed the scrolling behavior when...

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https://hg.mozilla.org/integration/gaia-central/rev/36d8420457e5
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 947977 - [Messages] Bug 936370 regressed the scrolling behavior when redacting a multi-line message r=schung

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "6b47496c2c4527af397e7b0dc70780a84c2ae101", 
+    "revision": "6848389ae79d70a81c82c7ad8ed5275002fd691c", 
     "repo_path": "/integration/gaia-central"
 }