Remove dependency on cc::TestNowSource from scheduler code

content/child/scheduler/worker_scheduler_impl.h

Index: content/child/scheduler/worker_scheduler_impl.h
diff --git a/content/child/scheduler/worker_scheduler_impl.h b/content/child/scheduler/worker_scheduler_impl.h
index 043476dbf627f7356299964e0ac12d26cb025fb6..6ab1b2afc0b6a3157ecdf114c698ed8659da8847 100644
--- a/content/child/scheduler/worker_scheduler_impl.h
+++ b/content/child/scheduler/worker_scheduler_impl.h
@@ -17,6 +17,7 @@ class ConvertableToTraceFormat;
 namespace content {
 
 class NestableSingleThreadTaskRunner;
+class TimeSource;
 
 class CONTENT_EXPORT WorkerSchedulerImpl
     : public WorkerScheduler,
@@ -37,7 +38,7 @@ class CONTENT_EXPORT WorkerSchedulerImpl
   void Init() override;
   void Shutdown() override;
 
-  void SetTimeSourceForTesting(scoped_refptr<cc::TestNowSource> time_source);
+  void SetTimeSourceForTesting(scoped_ptr<TimeSource> time_source);
   void SetWorkBatchSizeForTesting(size_t work_batch_size);
   base::TimeTicks CurrentIdleTaskDeadlineForTesting() const;