Replaced TestNowSource with SimpleTestTickClock.

components/scheduler/child/test_time_source.h

Index: components/scheduler/child/test_time_source.h
diff --git a/components/scheduler/child/test_time_source.h b/components/scheduler/child/test_time_source.h
index 4190ea1666208d7affbf6643226df89b7b97b531..d8bd1742e013e6f9c89c8040ffbbfa142b09cd7e 100644
--- a/components/scheduler/child/test_time_source.h
+++ b/components/scheduler/child/test_time_source.h
@@ -6,23 +6,21 @@
 #define COMPONENTS_SCHEDULER_CHILD_TEST_TIME_SOURCE_H_
 
 #include "base/memory/ref_counted.h"
+#include "base/test/simple_test_tick_clock.h"
 #include "base/time/tick_clock.h"
 
-namespace cc {
-class TestNowSource;
-}
-
 namespace scheduler {
 
 class TestTimeSource : public base::TickClock {
  public:
-  explicit TestTimeSource(scoped_refptr<cc::TestNowSource> time_source);
+  explicit TestTimeSource(base::SimpleTestTickClock* time_source);
   ~TestTimeSource() override;
 
   base::TimeTicks NowTicks() override;
 
  private:
-  scoped_refptr<cc::TestNowSource> time_source_;
+  // Not owned.
+  base::SimpleTestTickClock* time_source_;
 
   DISALLOW_COPY_AND_ASSIGN(TestTimeSource);
 };