Bug 1414514 - [mochitest] Dump http status when failing to load test manifest, r=jmaher

MozReview-Commit-ID: 4yRSWa1m0Kt

--HG--
extra : rebase_source : 2c72544c993015793005e912bf221a9e5abb710a

testing/mochitest/manifestLibrary.js

@@ -48,11 +48,11 @@ function getTestManifest(url, params, callback) {
         try {
           parseTestManifest(JSON.parse(req.responseText), params, callback);
         } catch (e) {
-          dump("TEST-UNEXPECTED-FAIL: setup.js | error parsing " + url + " (" + e + ")\n");
+          dump("TEST-UNEXPECTED-FAIL: manifestLibrary.js | error parsing " + url + " (" + e + ")\n");
           throw e;
         }
       } else {
-        dump("TEST-UNEXPECTED-FAIL: setup.js | error loading " + url + "\n");
+        dump("TEST-UNEXPECTED-FAIL: manifestLibrary.js | error loading " + url + " (HTTP " + req.status + ")\n");
         callback({});
       }
     }