[Telemetry] Rename page_test to legacy_page_test

telemetry/telemetry/benchmark_unittest.py

Index: telemetry/telemetry/benchmark_unittest.py
diff --git a/telemetry/telemetry/benchmark_unittest.py b/telemetry/telemetry/benchmark_unittest.py
index d26dccec9d27d4543d44b89dfae6bc397bce11b2..9de14d86d900082bed3a6fdb59426c384da148a9 100644
--- a/telemetry/telemetry/benchmark_unittest.py
+++ b/telemetry/telemetry/benchmark_unittest.py
@@ -10,13 +10,13 @@ from telemetry import benchmark
 from telemetry.testing import options_for_unittests
 from telemetry.internal import story_runner
 from telemetry import page
-from telemetry.page import page_test
+from telemetry.page import legacy_page_test
 from telemetry.page import shared_page_state
 from telemetry import story as story_module
 from telemetry.web_perf import timeline_based_measurement
 
 
-class DummyPageTest(page_test.PageTest):
+class DummyPageTest(legacy_page_test.LegacyPageTest):
   def ValidateAndMeasurePage(self, *_):
     pass