Remove |file_list| parameter from |TryChange()|.

trychange.py

 #!/usr/bin/env python
 # Copyright (c) 2011 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.
 
 """Client-side script to send a try job to the try server. It communicates to
 the try server by either writting to a svn repository or by directly connecting
 to the server by HTTP.
 """
 
@@ skipping 472 matching lines @@
         file_path = new_file.split('\t')[0].strip()
         if file_path.startswith('a/'):
           file_path = file_path[2:]
         changed_files.append(('M', file_path))
       diff[i] = diff[i][0:4] + new_file
   return (diff, changed_files)
 
 
 def TryChange(argv,
               change,
-              file_list,
               swallow_exception,
               prog=None,
               extra_epilog=None):
   """
   Args:
     argv: Arguments and options.
-    file_list: Default value to pass to --file.
+    change: Change instance corresponding to the CL.
     swallow_exception: Whether we raise or swallow exceptions.
   """
+  file_list = []
+  if change:
+    file_list = [f.LocalPath() for f in change.AffectedFiles()]
+
   # Parse argv
   parser = optparse.OptionParser(usage=USAGE,
                                  version=__version__,
                                  prog=prog)
   epilog = EPILOG % { 'prog': prog }
   if extra_epilog:
     epilog += extra_epilog
   parser.epilog = epilog
   # Remove epilog formatting
   parser.format_epilog = lambda x: parser.epilog
@@ skipping 286 matching lines @@
     print >> sys.stderr, e
     return 1
   except (gclient_utils.Error, subprocess2.CalledProcessError), e:
     print >> sys.stderr, e
     return 1
   return 0
 
 
 if __name__ == "__main__":
   fix_encoding.fix_encoding()
-  sys.exit(TryChange(None, None, [], False))
+  sys.exit(TryChange(None, None, False))