Bug 1474139: Follow-up: Fix test that relied on Timer.jsm being implicitly imported. r=bustage,test-only CLOSED TREE

devtools/client/sourceeditor/test/helper_codemirror_runner.js

@@ -28,6 +28,7 @@ function runCodeMirrorTest(browser) {
   //     setting a timeout to check again if not.
   /* eslint-disable max-len */
   mm.loadFrameScript("data:," +
+    "ChromeUtils.import('resource://gre/modules/Timer.jsm');" +
     "content.wrappedJSObject.mozilla_setStatus = function(statusMsg, type, customMsg) {" +
     "  sendSyncMessage('setStatus', {statusMsg: statusMsg, type: type, customMsg: customMsg});" +
     "};" +