Bug 1235964 - Fix dead CPOW intermittent. r=bgrins

MozReview-Commit-ID: 7KGew84XUHs

--HG--
extra : transplant_source : %9E%B9%08%EC%CE%5D%A1%1EF0%17%93%28%D9%BB%C0%88%B7%5D%F9

devtools/client/webconsole/test/browser_webconsole_bug_601177_log_levels.js

@@ -29,7 +29,7 @@ add_task(function* () {
 });
 
 function testLogLevels(hud) {
-  content.location = TEST_URI2;
+  BrowserTestUtils.loadURI(gBrowser.selectedBrowser, TEST_URI2);
 
   info("waiting for messages");