Remove the newline from PyAuto login automation error message.

chrome/test/pyautolib/pyauto.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.
 
 """PyAuto: Python Interface to Chromium's Automation Proxy.
 
 PyAuto uses swig to expose Automation Proxy interfaces to Python.
 For complete documentation on the functionality available,
 run pydoc on this file.
@@ skipping 4697 matching lines @@
         'command': 'SubmitLoginForm',
         'username': username,
         'password': password,
     }
     self._GetResultFromJSONRequest(cmd_dict, windex=None)
     try:
       # TODO(craigdh): Add login failure events once PyAuto switches to mocked
       # GAIA authentication.
       self.GetNextEvent()
     except JSONInterfaceError as e:
-      raise JSONInterfaceError('%s\nLogin failed. Perhaps Chrome crashed, '
+      raise JSONInterfaceError('Login failed. Perhaps Chrome crashed, '
                                'failed to start, or the login flow is '
-                               'broken?' % str(e))
+                               'broken? Error message: %s' % str(e))
 
   def Logout(self):
     """Log out from ChromeOS and wait for session_manager to come up.
 
     This is equivalent to pressing the 'Sign out' button from the
     aura shell tray when logged in.
 
     Should be logged in to work. Re-initializes the automation channel
     after logout.
     """
@@ skipping 1727 matching lines @@
     successful = result.wasSuccessful()
     if not successful:
       pyauto_tests_file = os.path.join(self.TestsDir(), self._tests_filename)
       print >>sys.stderr, 'Tests can be disabled by editing %s. ' \
                           'Ref: %s' % (pyauto_tests_file, _PYAUTO_DOC_URL)
     sys.exit(not successful)
 
 
 if __name__ == '__main__':
   Main()