Make use of CheckCallAndFilter42 for gclient's git fetch.

gclient_utils.py

 # Copyright (c) 2012 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.
 
 """Generic utils."""
 
 import codecs
 import cStringIO
 import datetime
 import logging
@@ skipping 694 matching lines @@
       raise
 
     if rv == 0:
       return output.getvalue()
     if not retry:
       break
     print ("WARNING: subprocess %s failed; will retry after a short nap..." %
            debug_child_info)
     time.sleep(sleep_interval)
     sleep_interval *= 2
-  raise subprocess42.CalledProcessError(
+  # TODO(tandrii): change this to subprocess.CalledProcessError,
+  # beacuse subprocess42 doesn't have a class unlike subprocess2.
+  raise subprocess2.CalledProcessError(
       rv, args, kwargs.get('cwd', None), None, None)
 
 
 class GitFilter(object):
   """A filter_fn implementation for quieting down git output messages.
 
   Allows a custom function to skip certain lines (predicate), and will throttle
   the output of percentage completed lines to only output every X seconds.
   """
   PERCENT_RE = re.compile('(.*) ([0-9]{1,3})% .*')
@@ skipping 671 matching lines @@
     # Just incase we have some ~/blah paths.
     target = os.path.abspath(os.path.expanduser(target))
     if os.path.isfile(target) and os.access(target, os.X_OK):
       return target
     if sys.platform.startswith('win'):
       for suffix in ('.bat', '.cmd', '.exe'):
         alt_target = target + suffix
         if os.path.isfile(alt_target) and os.access(alt_target, os.X_OK):
           return alt_target
   return None