[Telemetry] Move from telemetry WaitFor to py_utils WaitFor

telemetry/telemetry/internal/backends/chrome/cros_test_case.py

Index: telemetry/telemetry/internal/backends/chrome/cros_test_case.py
diff --git a/telemetry/telemetry/internal/backends/chrome/cros_test_case.py b/telemetry/telemetry/internal/backends/chrome/cros_test_case.py
index 9a02663ba9c2b61212b9fb61a4a454e569862edb..75a822dd8c8c1f75c2957b4aeec95b8e20df5be5 100644
--- a/telemetry/telemetry/internal/backends/chrome/cros_test_case.py
+++ b/telemetry/telemetry/internal/backends/chrome/cros_test_case.py
@@ -11,6 +11,8 @@ from telemetry.internal.browser import browser_finder
 from telemetry.internal.browser import extension_to_load
 from telemetry.testing import options_for_unittests
 
+import py_utils
+
 
 class CrOSTestCase(unittest.TestCase):
   def setUp(self):
@@ -78,5 +80,5 @@ class CrOSTestCase(unittest.TestCase):
           window.__login_status = s;
         });
     ''')
-    return util.WaitFor(
+    return py_utils.WaitFor(
         lambda: extension.EvaluateJavaScript('window.__login_status'), 10)