[Cronet] run pylint in Cronet presubmit check

components/cronet/tools/generate_javadoc.py

 #!/usr/bin/env python
 #
 # Copyright 2015 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.
 
-import fnmatch
 import optparse
 import os
 import sys
 
 REPOSITORY_ROOT = os.path.abspath(os.path.join(
     os.path.dirname(__file__), '..', '..', '..'))
 
 sys.path.append(os.path.join(REPOSITORY_ROOT, 'build/android/gyp/util'))
 sys.path.append(os.path.join(REPOSITORY_ROOT, 'net/tools/net_docs'))
 import build_utils
@@ skipping 48 matching lines @@
 
   if options.depfile:
     input_paths = []
     for root, _, filenames in os.walk(options.input_dir):
       input_paths.extend(os.path.join(root, f) for f in filenames)
     build_utils.WriteDepfile(options.depfile,
                              input_paths + build_utils.GetPythonDependencies())
 
 if __name__ == '__main__':
   sys.exit(main())