Fix some path processing to work better on Windows.

checkout.py

 # coding=utf8
 # 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.
 """Manages a project checkout.
 
 Includes support for svn, git-svn and git.
 """
 
 import ConfigParser
@@ skipping 237 matching lines @@
 class SvnConfig(object):
   """Parses a svn configuration file."""
   def __init__(self, svn_config_dir=None):
     super(SvnConfig, self).__init__()
     self.svn_config_dir = svn_config_dir
     self.default = not bool(self.svn_config_dir)
     if not self.svn_config_dir:
       if sys.platform == 'win32':
         self.svn_config_dir = os.path.join(os.environ['APPDATA'], 'Subversion')
       else:
-        self.svn_config_dir = os.path.join(os.environ['HOME'], '.subversion')
+        self.svn_config_dir = os.path.expanduser(
+            os.path.join('~', '.subversion'))
     svn_config_file = os.path.join(self.svn_config_dir, 'config')
     parser = ConfigParser.SafeConfigParser()
     if os.path.isfile(svn_config_file):
       parser.read(svn_config_file)
     else:
       parser.add_section('auto-props')
     self.auto_props = dict(parser.items('auto-props'))
 
 
 class SvnMixIn(object):
@@ skipping 560 matching lines @@
   def revisions(self, rev1, rev2):
     return self.checkout.revisions(rev1, rev2)
 
   @property
   def project_name(self):
     return self.checkout.project_name
 
   @property
   def project_path(self):
     return self.checkout.project_path