Remove psutil from the mini_installer test framework.

chrome/test/mini_installer/process_verifier.py

 # Copyright 2013 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 psutil
-
+import chrome_helper
 import path_resolver
 
 
 def VerifyProcesses(processes):
   """Verifies that the running processes match the expectation dictionaries.
 
   This method will throw an AssertionError if process state doesn't match the
   provided expectation.
 
   Args:
     processes: A dictionary whose keys are paths to processes and values are
         expectation dictionaries. An expectation dictionary is a dictionary with
         the following key and value:
             'running' a boolean indicating whether the process should be
                 running.
   """
   # Create a list of paths of all running processes.
-  running_process_paths = []
-  for process in psutil.process_iter():
-    try:
-      running_process_paths.append(process.exe)
-    except psutil.AccessDenied:
-      pass
+  running_process_paths = [path for (_, path) in
+                           chrome_helper.GetProcessIDAndPathPairs()]
 
   for process_path, expectation in processes.iteritems():
     process_resolved_path = path_resolver.ResolvePath(process_path)
     is_running = process_resolved_path in running_process_paths
     assert expectation['running'] == is_running, \
         ('Process %s is running' % process_path) if is_running else \
         ('Process %s is not running' % process_path)