Enforce utf-8 codec on all files read and write.

tests/gclient_utils_test.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.
 
 import os
 import StringIO
 import sys
 
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
@@ skipping 19 matching lines @@
     members = [
         'Annotated', 'AutoFlush', 'CheckCallAndFilter',
         'CheckCallAndFilterAndHeader', 'Error', 'ExecutionQueue', 'FileRead',
         'FileWrite', 'FindFileUpwards', 'FindGclientRoot',
         'GetGClientRootAndEntries', 'GetEditor', 'IsDateRevision',
         'MakeDateRevision', 'MakeFileAutoFlush', 'MakeFileAnnotated',
         'PathDifference', 'ParseCodereviewSettingsContent',
         'PrintableObject', 'RemoveDirectory', 'RunEditor',
         'SplitUrlRevision', 'SyntaxErrorToError',
         'UpgradeToHttps', 'Wrapper', 'WorkItem',
-        'errno', 'lockedmethod', 'logging', 'os', 'Queue', 're', 'rmtree',
-        'safe_makedirs', 'stat', 'subprocess2', 'sys', 'tempfile', 'threading',
-        'time', 'urlparse',
+        'codecs', 'errno', 'lockedmethod', 'logging', 'os', 'Queue', 're',
+        'rmtree', 'safe_makedirs', 'stat', 'subprocess2', 'sys', 'tempfile',
+        'threading', 'time', 'urlparse',
     ]
     # If this test fails, you should add the relevant test.
     self.compareMembers(gclient_utils, members)
 
 
 
 class CheckCallAndFilterTestCase(GclientUtilBase):
   class ProcessIdMock(object):
     def __init__(self, test_string):
       self.stdout = StringIO.StringIO(test_string)
@@ skipping 158 matching lines @@
     for content, expected in values:
       self.assertEquals(
           expected, gclient_utils.ParseCodereviewSettingsContent(content))
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()
 
 # vim: ts=2:sw=2:tw=80:et: