Make exceptions (e.g., reftest manifest errors) print the magic word for getting logged as errors. (Bug 468476) r=ted.mielczarek

layout/tools/reftest/reftest.js

@@ -151,7 +151,7 @@ function OnRefTestLoad()
     } catch (ex) {
         //gBrowser.loadURI('data:text/plain,' + ex);
         ++gTestResults.Exception;
-        dump("REFTEST TEST-FAIL | | EXCEPTION: " + ex + "\n");
+        dump("REFTEST TEST-UNEXPECTED-FAIL | | EXCEPTION: " + ex + "\n");
         DoneTests();
     }
 }