Removes dependency on v8 from dartc testing

compiler/scripts/dartc_wrapper.py

 #!/usr/bin/env python
-# Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+# Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 import os
 import sys
 
 
-SCRIPT_MAP = {
-  'dart': 'dartc_test',
-  'dartc': 'dartc',
-}
-
-
 def Main():
   script_name = os.path.basename(sys.argv[0])
   script_dir = os.path.dirname(sys.argv[0])
-  dartc_script = os.path.join(script_dir, 'compiler', 'bin',
-                              SCRIPT_MAP[script_name])
-  os.putenv("D8_EXEC", script_dir + "/d8")
+  dartc_script = os.path.join(script_dir, 'compiler', 'bin', 'dartc')
   os.putenv("DART_SCRIPT_NAME", script_name)
 
   return os.execv(dartc_script, [dartc_script] + sys.argv[1:])
 
 
 if __name__ == '__main__':
   sys.exit(Main())