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

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https://hg.mozilla.org/integration/gaia-central/rev/df6babb1ab17
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #12322 from davidflanagan/autocorrect-config

Bug 884752: configure keyboard layouts and dictionaries at build time r=janjongboom,luke-chang,aus

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https://hg.mozilla.org/integration/gaia-central/rev/54533d45d205
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 884752: configure keyboard layouts and dictionaries at build time

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "723401621af1bfabb671ec53ac7cafd62b700cb9", 
+    "revision": "df6babb1ab1723359803f7d8754939d56a39a066", 
     "repo_path": "/integration/gaia-central"
 }