[tools/perf] Update users of action_runner to directly referencing it from tab.action_runner field

tools/perf/benchmarks/service_worker.py

Index: tools/perf/benchmarks/service_worker.py
diff --git a/tools/perf/benchmarks/service_worker.py b/tools/perf/benchmarks/service_worker.py
index 8542e540f1ba11a85d0e54f524969dd240072f85..6cef574cb9ed7d87c5480203ece87c8a90ea2a2a 100644
--- a/tools/perf/benchmarks/service_worker.py
+++ b/tools/perf/benchmarks/service_worker.py
@@ -9,7 +9,6 @@ import re
 from core import perf_benchmark
 
 from telemetry.core import util
-from telemetry.page import action_runner
 from telemetry.page import page_test
 from telemetry.timeline import async_slice as async_slice_module
 from telemetry.timeline import slice as slice_module
@@ -105,12 +104,11 @@ class _ServiceWorkerMeasurement(page_test.PageTest):
     self._speed_index.Start(page, tab)
 
   def ValidateAndMeasurePage(self, page, tab, results):
-    runner = action_runner.ActionRunner(tab)
     # timeline_controller requires creation of at least a single interaction
     # record. service_worker should be refactored to follow the
     # timeline_based_measurement or it should not re-use timeline_controller
     # logic for start & stop tracing.
-    with runner.CreateInteraction('_DummyInteraction'):
+    with tab.action_runner.CreateInteraction('_DummyInteraction'):
       pass
     tab.WaitForDocumentReadyStateToBeComplete(40)
     self._timeline_controller.Stop(tab, results)