Cleanup: removing unused descendants information from tracked objects

base/profiler/scoped_profile.cc

 // Copyright (c) 2011 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/profiler/scoped_profile.h"
 
 #include "base/location.h"
 #include "base/tracked_objects.h"
 
 
 namespace tracked_objects {
 
 
 ScopedProfile::ScopedProfile(const Location& location, Mode mode)
     : birth_(NULL) {
   if (mode == DISABLED)
     return;
 
   birth_ = ThreadData::TallyABirthIfActive(location);
   if (!birth_)
     return;
 
-  ThreadData::PrepareForStartOfRun(birth_);
   stopwatch_.Start();
 }
 
 ScopedProfile::~ScopedProfile() {
   if (!birth_)
     return;
 
   stopwatch_.Stop();
   ThreadData::TallyRunInAScopedRegionIfTracking(birth_, stopwatch_);
 }
 
 }  // namespace tracked_objects