Largely reduce the number of pylint warnings and fix one typo.

chrome-update.py

 #!/usr/bin/python
 # Copyright (c) 2009 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 os
 import re
 import subprocess
 import sys
 import urllib
 
 IS_WIN = sys.platform.startswith('win')
 BASE_URL = 'http://src.chromium.org/svn/trunk/tools/buildbot/scripts/'
 COMPILE_URL = BASE_URL + 'slave/compile.py'
 UTILS_URL = BASE_URL + 'common/chromium_utils.py'
 
 
-def Fetch(url, file):
-  if not os.path.exists(file):
-    urllib.urlretrieve(url, file)
+def Fetch(url, filename):
+  if not os.path.exists(filename):
+    urllib.urlretrieve(url, filename)
 
 
 def GetLastestRevision():
   """Returns the revision number of the last build that was archived, or
   None on failure."""
   url = 'http://build.chromium.org/buildbot/continuous/'
   if sys.platform.startswith('win'):
     url += 'win/'
   elif sys.platform.startswith('linux'):
     url += 'linux/'
@@ skipping 15 matching lines @@
   """gclient sync to the latest build."""
   cmd = ["gclient", "sync"]
   rev = GetLastestRevision()
   if rev:
     cmd.extend(['--revision', 'src@%d' % rev])
   return subprocess.call(cmd, cwd=chrome_root, shell=IS_WIN)
 
 
 def DoBuild(chrome_root, args):
   """Download compile.py and run it."""
-  compile = os.path.join(chrome_root, 'compile.py')
-  Fetch(COMPILE_URL, compile)
+  compile_path = os.path.join(chrome_root, 'compile.py')
+  Fetch(COMPILE_URL, compile_path)
   Fetch(UTILS_URL, os.path.join(chrome_root, 'chromium_utils.py'))
-  cmd = ['python', compile] + args
+  cmd = ['python', compile_path] + args
   return subprocess.call(cmd, cwd=chrome_root, shell=IS_WIN)
 
 
 def Main(args):
   if len(args) < 3:
     print('Usage: chrome-update.py <path> [options]')
     print('See options from compile.py at')
     print('  %s' % COMPILE_URL)
     print('\nFor more example, see the compile steps on the waterfall')
     return 1
 
   chrome_root = args[1]
   if not os.path.isdir(chrome_root):
     print('Path to chrome root (%s) not found.' % chrome_root)
     return 1
 
   rv = DoUpdate(chrome_root)
   if rv != 0:
     print('Update Failed.  Bailing.')
     return rv
 
   DoBuild(chrome_root, args[2:])
   print('Success!')
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(Main(sys.argv))