Kills TraceTicks, which was functionally the same as TimeTicks

components/scheduler/child/idle_helper.h

Index: components/scheduler/child/idle_helper.h
diff --git a/components/scheduler/child/idle_helper.h b/components/scheduler/child/idle_helper.h
index 37ef636d23effe18a57820ef346960a9527a5915..5b673804d2065f5cb601ca401dea3c9bbf37ef9f 100644
--- a/components/scheduler/child/idle_helper.h
+++ b/components/scheduler/child/idle_helper.h
@@ -150,8 +150,8 @@ class SCHEDULER_EXPORT IdleHelper
    private:
     void TraceEventIdlePeriodStateChange(IdlePeriodState new_state,
                                          bool new_running_idle_task,
-                                         base::TraceTicks new_deadline,
-                                         base::TraceTicks optional_now);
+                                         base::TimeTicks new_deadline,
+                                         base::TimeTicks optional_now);
 
     SchedulerHelper* helper_;  // NOT OWNED
     Delegate* delegate_;       // NOT OWNED
@@ -159,8 +159,7 @@ class SCHEDULER_EXPORT IdleHelper
     IdlePeriodState idle_period_state_;
     base::TimeTicks idle_period_deadline_;
 
-    base::TraceTicks idle_period_deadline_for_tracing_;
-    base::TraceTicks last_idle_task_trace_time_;
+    base::TimeTicks last_idle_task_trace_time_;
     bool idle_period_trace_event_started_;
     bool running_idle_task_for_tracing_;
     const char* tracing_category_;