Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/e1845bb40c44
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1049137 - Disable intermittent failing test, TEST-UNEXPECTED-FAIL | /builds/slave/test/gaia/apps/system/test/marionette/app_usage_metrics_test.js | App Usage Metrics > Uninstalled apps are counted

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "679e72beb9f565d71cf7c5ce8fb4d6f69049b3d6", 
+    "revision": "e1845bb40c44e26343958a6c4783904e52a4df18", 
     "repo_path": "/integration/gaia-central"
 }