Cleanup: removing unused descendants information from tracked objects

base/threading/sequenced_worker_pool.cc

 // Copyright (c) 2012 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 "base/threading/sequenced_worker_pool.h"
 
 #include <list>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 759 matching lines @@
           SignalHasWork();
           delete_these_outside_lock.clear();
 
           // Complete thread creation outside the lock if necessary.
           if (new_thread_id)
             FinishStartingAdditionalThread(new_thread_id);
 
           this_worker->set_running_task_info(
               SequenceToken(task.sequence_token_id), task.shutdown_behavior);
 
-          tracked_objects::ThreadData::PrepareForStartOfRun(task.birth_tally);
           tracked_objects::TaskStopwatch stopwatch;
           stopwatch.Start();
           task.task.Run();
           stopwatch.Stop();
 
           tracked_objects::ThreadData::TallyRunOnNamedThreadIfTracking(
               task, stopwatch);
 
           // Make sure our task is erased outside the lock for the
           // same reason we do this with delete_these_oustide_lock.
@@ skipping 511 matching lines @@
 void SequencedWorkerPool::Shutdown(int max_new_blocking_tasks_after_shutdown) {
   DCHECK(constructor_message_loop_->BelongsToCurrentThread());
   inner_->Shutdown(max_new_blocking_tasks_after_shutdown);
 }
 
 bool SequencedWorkerPool::IsShutdownInProgress() {
   return inner_->IsShutdownInProgress();
 }
 
 }  // namespace base