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

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https://hg.mozilla.org/integration/gaia-central/rev/904edc49b926
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #31396 from arcturus/bug-1191729

[Contacts]Screen will flash once or twice after you tap "Find duplica…

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https://hg.mozilla.org/integration/gaia-central/rev/43a6d5da9109
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Bug 1191729 - [Contacts]Screen will flash once or twice after you tap "Find duplicate contacts" r=borjasalguero

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "65102bb1206b3d14e00d9971d87a346caeb3c4f5", 
+        "git_revision": "1ebec25fa866bae69ef96367efcaf92ff1299a70", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "6893dd205c4d71a7c52a16961baa53500c8e1db3", 
+    "revision": "904edc49b926651e87e9db94513cf9c63bfbaee5", 
     "repo_path": "integration/gaia-central"
 }