Bug 567267 - reenable unit test, r=dwitte, a=blocking-fennec2.0b1,mfinkle

--HG--
rename : uriloader/exthandler/tests/unit_ipc/disable_t_encoding.js => uriloader/exthandler/tests/unit_ipc/test_encoding.js

uriloader/exthandler/tests/unit_ipc/test_encoding.js

@@ -72,7 +72,22 @@ function getFactory(comp)
     }
   }
 }
+
+// Override the download-manager-ui to prevent anyone from trying to open
+// a window.
+function DownloadMgrUI() { }
+DownloadMgrUI.prototype = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIDownloadManagerUI]),
+  contractID: "@mozilla.org/download-manager-ui;1",
+  show: function (ir, aID, reason) { },
+
+  visible: false,
+
+  getAttention: function () { }
+}
+
 registerTemporaryComponent(HelperAppDlg);
+registerTemporaryComponent(DownloadMgrUI);
 
 function initChildTestEnv()
 {