Add code to 'fix' python encoding and it's unit test.

tests/presubmit_unittest.py

 #!/usr/bin/python
 # Copyright (c) 2010 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.
 
 """Unit tests for presubmit_support.py and presubmit_canned_checks.py."""
 
 # pylint is too confused.
 # pylint: disable=E1101,E1103,W0212,W0403
 
@@ skipping 123 matching lines @@
 
   def testMembersChanged(self):
     self.mox.ReplayAll()
     members = [
       'AffectedFile', 'Change', 'DoGetTrySlaves', 'DoPresubmitChecks',
       'GetTrySlavesExecuter', 'GitAffectedFile',
       'GitChange', 'InputApi', 'ListRelevantPresubmitFiles', 'Main',
       'NotImplementedException', 'OutputApi', 'ParseFiles',
       'PresubmitExecuter', 'PresubmitOutput', 'ScanSubDirs',
       'SvnAffectedFile', 'SvnChange', 'cPickle', 'cStringIO',
-      'exceptions', 'fnmatch', 'gclient_utils', 'glob', 'json', 'load_files',
+      'exceptions', 'fix_encoding', 'fnmatch', 'gclient_utils', 'glob', 'json',
+      'load_files',
       'logging', 'marshal', 'normpath', 'optparse', 'os', 'owners', 'pickle',
       'presubmit_canned_checks', 'random', 're', 'scm', 'subprocess',
       'sys', 'tempfile', 'time', 'traceback', 'types', 'unittest', 'urllib2',
       'warn',
     ]
     # If this test fails, you should add the relevant test.
     self.compareMembers(presubmit, members)
 
   def testListRelevantPresubmitFiles(self):
     join = presubmit.os.path.join
@@ skipping 1812 matching lines @@
 
   def testCannedCheckOwners_HTTPS_HostURL(self):
     self.OwnersTest(is_committing=True,
         approvers=set(['ben@example.com']),
         uncovered_files=set(), host_url='https://localhost')
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()