Change base::TickClock to a ref counted class.

components/copresence/timed_map_unittest.cc

Index: components/copresence/timed_map_unittest.cc
diff --git a/components/copresence/timed_map_unittest.cc b/components/copresence/timed_map_unittest.cc
index dcf2266add5a6cd3416fa1dac66fe9511c0d869c..9ebb04ec4ddd2e8c2e1c2894df5593a8d87c1dc6 100644
--- a/components/copresence/timed_map_unittest.cc
+++ b/components/copresence/timed_map_unittest.cc
@@ -97,9 +97,9 @@ TEST_F(TimedMapTest, TimedEvict) {
   const int kLargeTimeValueSeconds = 9999;
   Map map(base::TimeDelta::FromSeconds(kLargeTimeValueSeconds), 2);
 
-  // The map takes ownership of the clock, but we retain a pointer.
-  base::SimpleTestTickClock* clock = new base::SimpleTestTickClock;
-  map.set_clock_for_testing(make_scoped_ptr<base::TickClock>(clock));
+  scoped_refptr<base::SimpleTestTickClock> clock =
+      new base::SimpleTestTickClock;
+  map.set_clock_for_testing(clock);
 
   // Add value at T=0.
   map.Add(0x1337, Value(0x7331));