mus ws: Move 'reset(new' to base::MakeUnique.

services/ui/ws/user_activity_monitor_unittest.cc

Index: services/ui/ws/user_activity_monitor_unittest.cc
diff --git a/services/ui/ws/user_activity_monitor_unittest.cc b/services/ui/ws/user_activity_monitor_unittest.cc
index b91db6fa88a5445d70c6be5ce0b8d3b554d08f1b..2275c1843ab951f3baf9e426e715187c21f28f03 100644
--- a/services/ui/ws/user_activity_monitor_unittest.cc
+++ b/services/ui/ws/user_activity_monitor_unittest.cc
@@ -92,7 +92,8 @@ class UserActivityMonitorTest : public testing::Test {
     task_runner_ = make_scoped_refptr(new base::TestMockTimeTaskRunner(
         base::Time::Now(), base::TimeTicks::Now()));
     message_loop_.SetTaskRunner(task_runner_);
-    monitor_.reset(new UserActivityMonitor(task_runner_->GetMockTickClock()));
+    monitor_ =
+        base::MakeUnique<UserActivityMonitor>(task_runner_->GetMockTickClock());
   }
 
   base::MessageLoop message_loop_;