Make it possible to run a test only in the standard variant.

test/benchmarks/testcfg.py

 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 154 matching lines @@
         ("http://kraken-mirror.googlecode.com/svn/trunk/kraken/tests/"
          "kraken-1.1/"),
         "8", "kraken")
 
     self._DownloadIfNecessary(
         "http://octane-benchmark.googlecode.com/svn/trunk/",
         "22", "octane")
 
     os.chdir(old_cwd)
 
-  def VariantFlags(self):
+  def VariantFlags(self, testcase, default_flags):
     # Both --nocrankshaft and --stressopt are very slow.
     return [[]]
 
 
 def GetSuite(name, root):
   return BenchmarksTestSuite(name, root)