Make test262 test runner check for which exception is thrown

test/mozilla/testcfg.py

Index: test/mozilla/testcfg.py
diff --git a/test/mozilla/testcfg.py b/test/mozilla/testcfg.py
index 5739391102fc3abae1aec474c2cc45e1255a863b..4a96c25b916f143505e6d5958c5d859e3e398b6c 100644
--- a/test/mozilla/testcfg.py
+++ b/test/mozilla/testcfg.py
@@ -107,8 +107,8 @@ class MozillaTestSuite(testsuite.TestSuite):
   def IsNegativeTest(self, testcase):
     return testcase.path.endswith("-n")
 
-  def IsFailureOutput(self, output, testpath):
-    if output.exit_code != 0:
+  def IsFailureOutput(self, testcase):
+    if testcase.output.exit_code != 0:
       return True
     return "FAILED!" in output.stdout