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

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https://hg.mozilla.org/integration/gaia-central/rev/ac125ca91aec
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23284 from KevinGrandon/bug_1058270_change_browser_role

Bug 1058270 - Hide the browser app by changing role to system

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https://hg.mozilla.org/integration/gaia-central/rev/fdf2ec3b1613
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1058270 - Hide the browser app by changing role to system r=qdot

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "7b70ba3655ab01b351122ccf56c858c77fc255f2", 
+    "revision": "ac125ca91aec0f6fd13443a5b41e42a3e837fdcf", 
     "repo_path": "/integration/gaia-central"
 }