[scheduler]: Avoid waking up the scheduler to end long idle periods.

components/scheduler/child/worker_scheduler_impl.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/scheduler/child/worker_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
@@ skipping 71 matching lines @@
 SchedulerHelper* WorkerSchedulerImpl::GetSchedulerHelperForTesting() {
   return &helper_;
 }
 
 bool WorkerSchedulerImpl::CanEnterLongIdlePeriod(base::TimeTicks,
                                                  base::TimeDelta*) {
   return true;
 }
 
 base::TimeTicks WorkerSchedulerImpl::CurrentIdleTaskDeadlineForTesting() const {
-  base::TimeTicks deadline;
-  idle_helper_.CurrentIdleTaskDeadlineCallback(&deadline);
-  return deadline;
+  return idle_helper_.CurrentIdleTaskDeadline();
 }
 
 }  // namespace scheduler