PyLint fixes for tools-webrtc and webrtc/tools

webrtc/examples/androidtests/video_quality_loopback_test.py

 #!/usr/bin/env python
 # Copyright (c) 2017 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.
 
 """
@@ skipping 71 matching lines @@
   _RunCommand([sys.executable, test_script])
 
   # Pull the output video.
   test_video = os.path.join(temp_dir, 'test_video.y4m')
   _RunCommand(['adb', 'pull', '/sdcard/output.y4m', test_video])
 
   test_video_yuv = os.path.join(temp_dir, 'test_video.yuv')
 
   ffmpeg_path = os.path.join(toolchain_dir, 'linux', 'ffmpeg')
 
-  def convert_video(input_video, output_video):
+  def ConvertVideo(input_video, output_video):
     _RunCommand([ffmpeg_path, '-y', '-i', input_video, output_video])
 
-  convert_video(test_video, test_video_yuv)
+  ConvertVideo(test_video, test_video_yuv)
 
   reference_video = os.path.join(SRC_DIR,
       'resources', 'reference_video_640x360_30fps.y4m')
 
   reference_video_yuv = os.path.join(temp_dir,
       'reference_video_640x360_30fps.yuv')
 
-  convert_video(reference_video, reference_video_yuv)
+  ConvertVideo(reference_video, reference_video_yuv)
 
   # Run compare script.
   compare_script = os.path.join(SRC_DIR, 'webrtc', 'tools',
       'compare_videos.py')
   zxing_path = os.path.join(toolchain_dir, 'linux', 'zxing')
 
   # The frame_analyzer binary should be built for local computer and not for
   # Android
   frame_analyzer = os.path.join(build_dir_x86, 'frame_analyzer')
 
@@ skipping 10 matching lines @@
       '--stats_file_ref', stats_file_ref,
       '--stats_file_test', stats_file_test, '--frame_analyzer', frame_analyzer,
       '--ffmpeg_path', ffmpeg_path, '--zxing_path', zxing_path])
 
   shutil.rmtree(temp_dir)
 
 
 if __name__ == '__main__':
   sys.exit(main())