old_contents: # Copyright 2013 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.
  
  """Verifies that the histograms XML file is well-formatted."""
  
  import extract_histograms
  import os.path
  
  
  def main():
    # This will raise an exception if the file is not well-formatted.
    xml_file = os.path.join(os.path.dirname(os.path.realpath(__file__)),
                            'histograms.xml')
    histograms = extract_histograms.ExtractHistograms(xml_file)
  
  
  if __name__ == '__main__':
    main()
  
  
new_contents: #!/usr/bin/env python
  # Copyright 2013 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.
  
  """Verifies that the histograms XML file is well-formatted."""
  
  import extract_histograms
  import os.path
  
  
  def main():
    # This will raise an exception if the file is not well-formatted.
    xml_file = os.path.join(os.path.dirname(os.path.realpath(__file__)),
                            'histograms.xml')
    histograms = extract_histograms.ExtractHistograms(xml_file)
  
  
  if __name__ == '__main__':
    main()
  
  
subject: Add shebang to histograms/validate_format.py.