Change base::TickClock to a ref counted class.

components/network_time/network_time_tracker_unittest.cc

Index: components/network_time/network_time_tracker_unittest.cc
diff --git a/components/network_time/network_time_tracker_unittest.cc b/components/network_time/network_time_tracker_unittest.cc
index 60d316eb3c3183fd99813a413812e12b8f5394d5..1fa8d03bcc45d1ed547b67e72804d9a4f0ea1a18 100644
--- a/components/network_time/network_time_tracker_unittest.cc
+++ b/components/network_time/network_time_tracker_unittest.cc
@@ -30,13 +30,14 @@ const int64 kPseudoSleepTime2 = 1888;
 class TestTickClock : public base::TickClock {
  public:
   explicit TestTickClock(base::TimeTicks* ticks_now) : ticks_now_(ticks_now) {}
-  virtual ~TestTickClock() {}
 
   virtual base::TimeTicks NowTicks() override {
     return *ticks_now_;
   }
 
  private:
+  virtual ~TestTickClock() {}
+
   base::TimeTicks* ticks_now_;
 };
 
@@ -51,7 +52,7 @@ class NetworkTimeTrackerTest : public testing::Test {
 
     now_ = base::Time::NowFromSystemTime();
     network_time_tracker_.reset(new NetworkTimeTracker(
-        scoped_ptr<base::TickClock>(new TestTickClock(&ticks_now_)),
+        scoped_refptr<base::TickClock>(new TestTickClock(&ticks_now_)),
         &pref_service_));
   }