svn always add a \n at the end of the output.

presubmit_support.py

 #!/usr/bin/python
 # Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Enables directory-specific presubmit checks to run at upload and/or commit.
 """
 
 __version__ = '1.3.2'
 
@@ skipping 451 matching lines @@
         # querying subversion, especially on Windows.
         self._is_directory = os.path.isdir(path)
       else:
         self._is_directory = gclient.CaptureSVNInfo(
             path).get('Node Kind') in ('dir', 'directory')
     return self._is_directory
 
   def Property(self, property_name):
     if not property_name in self._properties:
       self._properties[property_name] = gcl.GetSVNFileProperty(
-          self.AbsoluteLocalPath(), property_name)
+          self.AbsoluteLocalPath(), property_name).rstrip()
     return self._properties[property_name]
 
   def IsTextFile(self):
     if self._is_text_file is None:
       if self.Action() == 'D':
         # A deleted file is not a text file.
         self._is_text_file = False
       elif self.IsDirectory():
         self._is_text_file = False
       else:
@@ skipping 328 matching lines @@
                                options.commit,
                                options.verbose,
                                sys.stdout,
                                sys.stdin,
                                None,
                                False)
 
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))