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

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https://hg.mozilla.org/integration/gaia-central/rev/e3d925b497f5
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #12097 from vingtetun/backout-fps-regression-contacts-fixed

Backout bug 903401 for fps regression on the contacts app

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https://hg.mozilla.org/integration/gaia-central/rev/f72ae79b2734
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Backout bug 903401 for fps regression on the contacts app

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "217c8bd7dc4051a0a5cbe016a3b48442fb212feb", 
+    "revision": "e3d925b497f5b996c9c397c200805fbcc62bc823", 
     "repo_path": "/integration/gaia-central"
 }