Fix last minute change in last commit

tools/utils.py

 # 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.
 
 # This file contains a set of utilities functions used by other Python-based
 # scripts.
 
 import commands
 import os
 import platform
@@ skipping 324 matching lines @@
   p = subprocess.Popen(['git', 'svn', 'info'], stdout = subprocess.PIPE,
       stderr = subprocess.STDOUT, shell=IsWindows(), cwd = DART_DIR)
   output, _ = p.communicate()
   revision = ParseSvnInfoOutput(output)
   if revision:
     return revision
 
   # When building from tarball use tools/SVN_REVISION
   svn_revision_file = os.path.join(DART_DIR, 'tools', 'SVN_REVISION')
   try:
-    with open(svn_revision_file) as fd
+    with open(svn_revision_file) as fd:
       return fd.read()
   except:
     pass
 
   # Only fail on the buildbot in case of a SVN client version mismatch.
   user = GetUserName()
   if user != 'chrome-bot':
     return '0'
 
   return None
@@ skipping 178 matching lines @@
     os.chdir(self._working_directory)
 
   def __exit__(self, *_):
     print "Enter directory = ", self._old_cwd
     os.chdir(self._old_cwd)
 
 
 if __name__ == "__main__":
   import sys
   Main(sys.argv)