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

git_cl_hooks.py

 # Copyright (c) 2010 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 breakpad
+import breakpad  # pylint: disable=W0611
 
 from git_cl_repo import git_cl
 from git_cl_repo import upload
 
 import presubmit_support
 import scm
 import watchlists
 
 # Really ugly hack to quiet upload.py
 upload.verbosity = 0
 
 def Backquote(cmd, cwd=None):
   """Like running `cmd` in a shell script."""
   return subprocess.Popen(cmd,
                           cwd=cwd,
                           stdout=subprocess.PIPE).communicate()[0].strip()
 
-def ConvertToInteger(input):
+def ConvertToInteger(inputval):
   """Convert a string to integer, but returns either an int or None."""
   try:
-    return int(input)
-  except TypeError, ValueError:
+    return int(inputval)
+  except (TypeError, ValueError):
     return None
 
 
 class ChangeOptions:
   def __init__(self, commit=None, upstream_branch=None):
     self.commit = commit
     self.verbose = None
     self.default_presubmit = None
     self.may_prompt = None
 
@@ skipping 39 matching lines @@
   if presubmit_support.DoPresubmitChecks(options.change,
                                          options.commit,
                                          options.verbose,
                                          sys.stdout,
                                          sys.stdin,
                                          options.default_presubmit,
                                          options.may_prompt):
     sys.exit(0)
   else:
     sys.exit(1)