Fix path on multivm slave

tools/dartium/download_multivm.py

 #!/usr/bin/python
 
 # Copyright (c) 2014, 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.
 
 """Download archived multivm or dartium builds.
 
   Usage: download_multivm.py revision target_directory
 """
 
 import imp
 import os
 import platform
 import shutil
 import subprocess
 import sys
 import tempfile
 
 # We are in [checkout dir]/src/dart/tools/dartium in a dartium/multivm checkout
 TOOLS_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 SRC_DIR = os.path.dirname(os.path.dirname(TOOLS_DIR))
 GS_BUCKET = 'gs://dartium-archive'
 if platform.system() == 'Windows':
   GSUTIL = 'e:\\b\\build\\scripts\\slave\\gsutil.bat'
+  if not os.path.exists(GSUTIL):
+    GSUTIL = 'c:\\b\\build\\scripts\\slave\\gsutil.bat'
 else:
   GSUTIL = '/b/build/scripts/slave/gsutil'
 if not os.path.exists(GSUTIL):
   GSUTIL = 'gsutil'
 
 class TempDir(object):
   def __init__(self, prefix=''):
     self._temp_dir = None
     self._prefix = prefix
 
@@ skipping 28 matching lines @@
       ExecuteCommand([executable, 'x', '-aoa', '-o' + temp_dir, zip_file])
     else:
       ExecuteCommand(['unzip', zip_file, '-d', temp_dir])
 
     if os.path.exists(target_dir):
       shutil.rmtree(target_dir)
     shutil.move(unzip_dir, target_dir)
 
 if __name__ == '__main__':
   sys.exit(main())