[Telemetry] Move from telemetry WaitFor to py_utils WaitFor

telemetry/telemetry/internal/actions/media_action.py

Index: telemetry/telemetry/internal/actions/media_action.py
diff --git a/telemetry/telemetry/internal/actions/media_action.py b/telemetry/telemetry/internal/actions/media_action.py
index 438f5259a186772c2d9f77092219b73c3d456f52..ee07c56220201e49ddcafdeab1c598a3314ad4f4 100644
--- a/telemetry/telemetry/internal/actions/media_action.py
+++ b/telemetry/telemetry/internal/actions/media_action.py
@@ -6,10 +6,11 @@
 
 import logging
 
-from telemetry.core import util
 from telemetry.internal.actions import page_action
 from telemetry.internal.actions import utils
 
+import py_utils
+
 
 class MediaAction(page_action.PageAction):
   def WillRunAction(self, tab):
@@ -29,9 +30,9 @@ class MediaAction(page_action.PageAction):
       timeout_in_seconds: Timeout to check for event, throws an exception if
           not fired.
     """
-    util.WaitFor(lambda:
-                     self.HasEventCompletedOrError(tab, selector, event_name),
-                 timeout=timeout_in_seconds)
+    py_utils.WaitFor(
+        lambda: self.HasEventCompletedOrError(tab, selector, event_name),
+        timeout=timeout_in_seconds)
 
   def HasEventCompletedOrError(self, tab, selector, event_name):
     if tab.EvaluateJavaScript(