Move t.p.PageMeasurementUnitTestBase to t.testing.PageTestTestCase.

tools/telemetry/telemetry/web_perf/timeline_based_measurement_unittest.py

Index: tools/telemetry/telemetry/web_perf/timeline_based_measurement_unittest.py
diff --git a/tools/telemetry/telemetry/web_perf/timeline_based_measurement_unittest.py b/tools/telemetry/telemetry/web_perf/timeline_based_measurement_unittest.py
index 2dff70561b01e3a3eb5653272b8f5f5d391abdef..acb3018993c042ad8b3ca057fb0de0e4c4a0e883 100644
--- a/tools/telemetry/telemetry/web_perf/timeline_based_measurement_unittest.py
+++ b/tools/telemetry/telemetry/web_perf/timeline_based_measurement_unittest.py
@@ -8,10 +8,10 @@ import unittest
 from telemetry import benchmark
 from telemetry.core import wpr_modes
 from telemetry.page import page as page_module
-from telemetry.page import page_measurement_unittest_base
-from telemetry.page import page_set
 from telemetry.page import page as page_module
+from telemetry.page import page_set
 from telemetry.results import page_test_results
+from telemetry.testing import page_test_test_case
 from telemetry.timeline import async_slice
 from telemetry.timeline import model as model_module
 from telemetry.unittest import options_for_unittests
@@ -194,8 +194,7 @@ class TestTimelinebasedMeasurementPage(page_module.Page):
       action_runner.WaitForJavaScriptCondition('window.jankScriptDone')
 
 
-class TimelineBasedMeasurementTest(
-    page_measurement_unittest_base.PageMeasurementUnitTestBase):
+class TimelineBasedMeasurementTest(page_test_test_case.PageTestTestCase):
 
   def setUp(self):
     self._options = options_for_unittests.GetCopy()