Remove error throw on bad DEFINES

tools/dom/scripts/fremontcutbuilder.py

 #!/usr/bin/python
 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 import database
 import databasebuilder
 import idlparser
 import logging.config
 import os.path
@@ skipping 84 matching lines @@
 
   conditionals_met = set(
       'ENABLE_' + conditional for conditional in builder.conditionals_met)
   known_conditionals = set(FEATURE_DEFINES + FEATURE_DISABLED)
 
   unused_conditionals = known_conditionals - conditionals_met
   if unused_conditionals:
     _logger.warning('There are some unused conditionals %s' %
         sorted(unused_conditionals))
     _logger.warning('Please update fremontcutbuilder.py')
-    raise 'Halt'
 
   unknown_conditionals = conditionals_met - known_conditionals
   if unknown_conditionals:
     _logger.warning('There are some unknown conditionals %s' %
         sorted(unknown_conditionals))
     _logger.warning('Please update fremontcutbuilder.py')
-    raise 'Halt'
 
   db.Save()
   return db
 
 def main(parallel=False):
   current_dir = os.path.dirname(__file__)
 
   idl_files = []
 
   webcore_dir = os.path.join(current_dir, '..', '..', '..', 'third_party',
@@ skipping 17 matching lines @@
       if ext == '.idl':
         idl_files.append(file_name)
 
   os.path.walk(webcore_dir, visitor, webcore_dir)
 
   database_dir = os.path.join(current_dir, '..', 'database')
   return build_database(idl_files, database_dir, parallel=parallel)
 
 if __name__ == '__main__':
   sys.exit(main())