depot_tools: make CheckLicense warn instead of notify

tests/presubmit_unittest.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.
 
 """Unit tests for presubmit_support.py and presubmit_canned_checks.py."""
 
 # pylint: disable=E1101,E1103
 
 import StringIO
@@ skipping 2306 matching lines @@
         "#!/bin/python\n"
         "# Copyright (c) 2037 Nobody.\n"
         "# All Rights Reserved.\n"
         "print 'foo'\n"
     )
     license_text = (
         r".*? Copyright \(c\) 0007 Nobody." "\n"
         r".*? All Rights Reserved\." "\n"
     )
     self._LicenseCheck(text, license_text, False,
-                       presubmit.OutputApi.PresubmitNotifyResult)
+                       presubmit.OutputApi.PresubmitPromptWarning)
 
   def testCheckLicenseEmptySuccess(self):
     text = ''
     license_text = (
         r".*? Copyright \(c\) 2037 Nobody." "\n"
         r".*? All Rights Reserved\." "\n"
     )
     self._LicenseCheck(text, license_text, True, None, accept_empty_files=True)
 
   def testCannedCheckSvnAccidentalSubmission(self):
@@ skipping 576 matching lines @@
         owners_check=False)
     self.assertEqual(2, len(results))
     self.assertEqual(
         'Found line ending with white spaces in:', results[0]._message)
     self.checkstdout('')
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()