Reland of PyLint fixes for tools-webrtc and webrtc/tools

webrtc/tools/barcode_tools/build_zxing.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import os
 import subprocess
 import sys
 
 
-def run_ant_build_command(path_to_ant_build_file):
+def RunAntBuildCommand(path_to_ant_build_file):
   """Tries to build the passed build file with ant."""
   ant_executable = 'ant'
   if sys.platform == 'win32':
     if os.getenv('ANT_HOME'):
       ant_executable = os.path.join(os.getenv('ANT_HOME'), 'bin', 'ant.bat')
     else:
       ant_executable = 'ant.bat'
   cmd = [ant_executable, '-buildfile', path_to_ant_build_file]
   try:
     process = subprocess.Popen(cmd, stdout=sys.stdout, stderr=sys.stderr)
     process.wait()
     if process.returncode != 0:
       print >> sys.stderr, 'Failed to execute: %s' % ' '.join(cmd)
     return process.returncode
   except subprocess.CalledProcessError as e:
     print >> sys.stderr, 'Failed to execute: %s.\nCause: %s' % (' '.join(cmd),
                                                                 e)
     return -1
 
-def _main():
+def main():
   core_build = os.path.join('third_party', 'zxing', 'core', 'build.xml')
-  run_ant_build_command(core_build)
+  RunAntBuildCommand(core_build)
 
   javase_build = os.path.join('third_party', 'zxing', 'javase', 'build.xml')
-  return run_ant_build_command(javase_build)
+  return RunAntBuildCommand(javase_build)
 
 
 if __name__ == '__main__':
-  sys.exit(_main())
+  sys.exit(main())