Fix some path processing to work better on Windows.

gcl.py

 #!/usr/bin/env python
 # 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.
 
 """\
 Wrapper script around Rietveld's upload.py that simplifies working with groups
 of files.
 """
 
@@ skipping 53 matching lines @@
 FILES_CACHE = {}
 
 # Valid extensions for files we want to lint.
 DEFAULT_LINT_REGEX = r"(.*\.cpp|.*\.cc|.*\.h)"
 DEFAULT_LINT_IGNORE_REGEX = r"$^"
 
 def CheckHomeForFile(filename):
   """Checks the users home dir for the existence of the given file.  Returns
   the path to the file if it's there, or None if it is not.
   """
-  home_vars = ['HOME']
-  if sys.platform in ('cygwin', 'win32'):
-    home_vars.append('USERPROFILE')
-  for home_var in home_vars:
-    home = os.getenv(home_var)
-    if home != None:
-      full_path = os.path.join(home, filename)
-      if os.path.exists(full_path):
-        return full_path
+  full_path = os.path.expanduser(os.path.join('~', filename))
+  if os.path.exists(full_path):
+    return full_path
   return None
 
 
 def UnknownFiles():
   """Runs svn status and returns unknown files."""
   return [
       item[1] for item in SVN.CaptureStatus([], GetRepositoryRoot())
       if item[0][0] == '?'
   ]
 
@@ skipping 1435 matching lines @@
     return 1
 
 
 if __name__ == "__main__":
   fix_encoding.fix_encoding()
   try:
     sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)