jsmin does not have our copyright header and shouldn't have. Exclude...

tools/presubmit.py

 #!/usr/bin/env python
 #
 # Copyright 2008 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 157 matching lines @@
 
   def GetPathsToSearch(self):
     return ['.']
 
   def IgnoreDir(self, name):
     return (super(SourceProcessor, self).IgnoreDir(name)
               or (name == 'third_party')
               or (name == 'obj'))
 
   IGNORE_COPYRIGHTS = ['earley-boyer.js', 'raytrace.js', 'crypto.js',
-      'libraries.cc', 'libraries-empty.cc']
+      'libraries.cc', 'libraries-empty.cc', 'jsmin.py']
   IGNORE_TABS = IGNORE_COPYRIGHTS + ['unicode-test.js',
       'html-comments.js']
 
   def ProcessContents(self, name, contents):
     result = True
     base = basename(name)
     if not base in SourceProcessor.IGNORE_TABS:
       if '\t' in contents:
         print "%s contains tabs" % name
         result = False
@@ skipping 31 matching lines @@
     success = CppLintProcessor().Run(workspace) and success
   success = SourceProcessor().Run(workspace) and success
   if success:
     return 0
   else:
     return 1
 
 
 if __name__ == '__main__':
   sys.exit(Main())