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

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https://hg.mozilla.org/integration/gaia-central/rev/dbfb03ac7296
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #10865 from lissyx/bug889245

Bug 889245 - [Call log] When user make a voicemail call, call log shows ...

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https://hg.mozilla.org/integration/gaia-central/rev/89fb5a99c545
Author: Alexandre Lissy <lissyx+mozillians@lissyx.dyndns.org>
Desc: Bug 889245 - [Call log] Display emergency number or Voicemail string

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https://hg.mozilla.org/integration/gaia-central/rev/a212e78a202b
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #11333 from crh0716/900386

Bug 900386 - Use localize function to do localization r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/e6fa4ecb565c
Author: crh0716 <crh0716@gmail.com>
Desc: Bug 900386 - Use localize function to do localization

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "20258a9a0b118f4b1c3345495c0b98cd3337b94e", 
+    "revision": "dbfb03ac729627f91bd63ad9d2830e0479bfb899", 
     "repo_path": "/integration/gaia-central"
 }