Fix pyauto process_test

chrome/test/functional/process_count.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 pyauto_functional
 import pyauto
 
@@ skipping 35 matching lines @@
       self.chrome_proc_name = self.CHROME_PROCESS_NAME['win']
     elif self.IsMac():
       self.proc_count_fresh_profile = self.FRESH_PROFILE_PROC_COUNT['mac']
       self.chrome_proc_name = self.CHROME_PROCESS_NAME['mac']
     elif self.IsLinux():
       self.proc_count_fresh_profile = self.FRESH_PROFILE_PROC_COUNT['linux']
       self.chrome_proc_name = self.CHROME_PROCESS_NAME['linux']
 
     pyauto.PyUITest.setUp(self)
 
+    self.NavigateToURL('about:blank')
+
   def _VerifyProcessCount(self, num_expected):
     """Verifies the number of Chrome-related processes is as expected.
 
     Args:
       num_expected: An integer representing the expected number of Chrome-
                     related processes that should currently exist.
     """
     proc_info = self.GetProcessInfo()
     browser_info = [x for x in proc_info['browsers']
                     if x['process_name'] == self.chrome_proc_name]
@@ skipping 63 matching lines @@
     self.OpenNewBrowserWindow(True)
 
     for _ in xrange(3):
       self.AppendTab(pyauto.GURL('about:blank'), 1)
 
     self._VerifyProcessCount(self.proc_count_fresh_profile + 8)
 
 
 if __name__ == '__main__':
   pyauto_functional.Main()