Fix a regression introduced in r114262, cwd must be a named argument to subprocess2.Popen().

scm.py

 # Copyright (c) 2011 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.
 
 """SCM-specific utility classes."""
 
 import cStringIO
 import glob
 import logging
 import os
@@ skipping 208 matching lines @@
     # 1) iterate through our branch history and find the svn URL.
     # 2) find the svn-remote that fetches from the URL.
 
     # regexp matching the git-svn line that contains the URL.
     git_svn_re = re.compile(r'^\s*git-svn-id: (\S+)@', re.MULTILINE)
 
     # We don't want to go through all of history, so read a line from the
     # pipe at a time.
     # The -100 is an arbitrary limit so we don't search forever.
     cmd = ['git', 'log', '-100', '--pretty=medium']
-    proc = subprocess2.Popen(cmd, cwd, stdout=subprocess2.PIPE)
+    proc = subprocess2.Popen(cmd, cwd=cwd, stdout=subprocess2.PIPE)
     url = None
     for line in proc.stdout:
       match = git_svn_re.match(line)
       if match:
         url = match.group(1)
         proc.stdout.close()  # Cut pipe.
         break
 
     if url:
       svn_remote_re = re.compile(r'^svn-remote\.([^.]+)\.url (.*)$')
@@ skipping 764 matching lines @@
         # revert, like for properties.
         if not os.path.isdir(cwd):
           # '.' was deleted. It's not worth continuing.
           return
         try:
           SVN.Capture(['revert', file_status[1]], cwd=cwd)
         except subprocess2.CalledProcessError:
           if not os.path.exists(file_path):
             continue
           raise