[Telemetry] Move from telemetry WaitFor to py_utils WaitFor

telemetry/telemetry/record_wpr.py

Index: telemetry/telemetry/record_wpr.py
diff --git a/telemetry/telemetry/record_wpr.py b/telemetry/telemetry/record_wpr.py
index 8b73640eff4b29dd0eb9eeb1f008526ae5e4c6a4..b7dd7592fad3b3cd088ee1b5c0fe7c6930c24886 100644
--- a/telemetry/telemetry/record_wpr.py
+++ b/telemetry/telemetry/record_wpr.py
@@ -9,7 +9,6 @@ import sys
 from telemetry import benchmark
 from telemetry import story
 from telemetry.core import discover
-from telemetry.core import util
 from telemetry.internal.browser import browser_options
 from telemetry.internal.results import results_options
 from telemetry.internal import story_runner
@@ -20,6 +19,8 @@ from telemetry.util import wpr_modes
 from telemetry.web_perf import timeline_based_measurement
 from telemetry.web_perf import timeline_based_page_test
 
+import py_utils
+
 DEFAULT_LOG_FORMAT = (
   '(%(levelname)s) %(asctime)s %(module)s.%(funcName)s:%(lineno)d  '
   '%(message)s')
@@ -52,7 +53,7 @@ class RecorderPageTest(legacy_page_test.LegacyPageTest):
     if self.page_test:
       self.page_test.DidNavigateToPage(page, tab)
     tab.WaitForDocumentReadyStateToBeComplete()
-    util.WaitFor(tab.HasReachedQuiescence, 30)
+    py_utils.WaitFor(tab.HasReachedQuiescence, 30)
 
   def CleanUpAfterPage(self, page, tab):
     if self.page_test: