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

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https://hg.mozilla.org/integration/gaia-central/rev/d512ea25e7b1
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #22621 from mancas/bug796428

Bug 796428 - [Quick Settings] Toggling Mobile data while roaming and Dat... r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/665c75de4b05
Author: Manuel Casas Barrado <manuel.casasbarrado@telefonica.com>
Desc: Bug 796428 - [Quick Settings] Toggling Mobile data while roaming and Data Roaming turned Off

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "19ce9b087fd7e506ec98ee90097581bd3f216d19", 
+    "revision": "d512ea25e7b119c4435d1263e9fd7259e09095c2", 
     "repo_path": "/integration/gaia-central"
 }