[Telemetry] Move from telemetry WaitFor to py_utils WaitFor

telemetry/telemetry/internal/browser/browser_unittest.py

Index: telemetry/telemetry/internal/browser/browser_unittest.py
diff --git a/telemetry/telemetry/internal/browser/browser_unittest.py b/telemetry/telemetry/internal/browser/browser_unittest.py
index 923d48257afdbff116cb999093eae55df68a8ffb..9c9b3edbb13a2ecfae8c88069522c496ae4a9fd9 100644
--- a/telemetry/telemetry/internal/browser/browser_unittest.py
+++ b/telemetry/telemetry/internal/browser/browser_unittest.py
@@ -8,7 +8,6 @@ import shutil
 import tempfile
 import unittest
 
-from telemetry.core import util
 from telemetry.core import exceptions
 from telemetry import decorators
 from telemetry.internal.browser import browser as browser_module
@@ -22,7 +21,7 @@ from telemetry.testing import options_for_unittests
 from telemetry.timeline import tracing_config
 
 import mock
-
+import py_utils
 
 class IntentionalException(Exception):
   pass
@@ -248,7 +247,8 @@ class BrowserRestoreSessionTest(unittest.TestCase):
       # old tabs and a new blank tab.
       expected_number_of_tabs = self._number_of_tabs + 1
       try:
-        util.WaitFor(lambda: len(browser.tabs) == expected_number_of_tabs, 10)
+        py_utils.WaitFor(
+            lambda: len(browser.tabs) == expected_number_of_tabs, 10)
       except:
         logging.error('Number of tabs is %s' % len(browser.tabs))
         raise