Fix the broken backout of bug 1438375 to reopen the CLOSED TREE.

--HG--
extra : amend_source : 1fa43b15c46f36d99ffc17e750d25d6c937486ee

browser/components/preferences/in-content/extensionControlled.js

@@ -59,14 +59,13 @@ let extensionControlledContentIds = {
 
 function getExtensionControlledArgs(settingName) {
   switch (settingName) {
-    case "proxyConfig":
+    case "proxy.settings":
       return [document.getElementById("bundleBrand").getString("brandShortName")];
     default:
       return [];
   }
 }
 
-
 let extensionControlledIds = {};
 
 /**