Remove dependency on cc::TestNowSource from scheduler code

content/child/scheduler/worker_scheduler_impl.cc

Index: content/child/scheduler/worker_scheduler_impl.cc
diff --git a/content/child/scheduler/worker_scheduler_impl.cc b/content/child/scheduler/worker_scheduler_impl.cc
index f63886882087b3cfd2bd6019f96f482d8fd97be0..c22c0c3157f967e8c89c312ddf6501ccde9cd2e8 100644
--- a/content/child/scheduler/worker_scheduler_impl.cc
+++ b/content/child/scheduler/worker_scheduler_impl.cc
@@ -75,9 +75,8 @@ void WorkerSchedulerImpl::Shutdown() {
   helper_.Shutdown();
 }
 
-void WorkerSchedulerImpl::SetTimeSourceForTesting(
-    scoped_refptr<cc::TestNowSource> time_source) {
-  helper_.SetTimeSourceForTesting(time_source);
+SchedulerHelper* WorkerSchedulerImpl::GetSchedulerHelperForTesting() {
+  return &helper_;
 }
 
 void WorkerSchedulerImpl::SetWorkBatchSizeForTesting(size_t work_batch_size) {