Update README.chromium to reflect whether a tool is shipped or not

tools/licenses.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Utility for checking and processing licensing information in third_party
 directories.
 
 Usage: licenses.py <command>
 
@@ skipping 67 matching lines @@
     # Chrome for Android proprietary code.
     os.path.join('clank'),
 
     # Redistribution does not require attribution in documentation.
     os.path.join('third_party','directxsdk'),
     os.path.join('third_party','platformsdk_win2008_6_1'),
     os.path.join('third_party','platformsdk_win7'),
 
     # For testing only, presents on some bots.
     os.path.join('isolate_deps_dir'),
+
+    # Overrides some WebRTC files, same license. Skip this one.
+    os.path.join('third_party', 'webrtc_overrides'),
 ])
 
 # Directories we don't scan through.
 VCS_METADATA_DIRS = ('.svn', '.git')
 PRUNE_DIRS = (VCS_METADATA_DIRS +
               ('out', 'Debug', 'Release',  # build files
                'layout_tests'))            # lots of subdirs
 
 ADDITIONAL_PATHS = (
     os.path.join('breakpad'),
@@ skipping 394 matching lines @@
         if not GenerateCredits(args.file_template, args.entry_template,
                                args.output_file):
             return 1
     else:
         print __doc__
         return 1
 
 
 if __name__ == '__main__':
   sys.exit(main())