Fix presubmit check output when the items are AffectedFile instances.

presubmit_support.py

 #!/usr/bin/python
 # Copyright (c) 2010 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__ = '1.4'
 
@@ skipping 128 matching lines @@
       if items:
         self._items = items
       self._long_text = long_text.rstrip()
 
     def handle(self, output):
       output.write(self._message)
       output.write('\n')
       for index, item in enumerate(self._items):
         output.write('  ')
         # Write separately in case it's unicode.
-        output.write(item)
+        output.write(str(item))
         if index < len(self._items) - 1:
           output.write(' \\')
         output.write('\n')
       if self._long_text:
         output.write('\n***************\n')
         # Write separately in case it's unicode.
         output.write(self._long_text)
         output.write('\n***************\n')
       if self.fatal:
         output.fail()
@@ skipping 1028 matching lines @@
                               sys.stdout,
                               sys.stdin,
                               options.default_presubmit,
                               options.may_prompt)
   return not results.should_continue()
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   sys.exit(Main(None))