Revert 107895 - Fully enable about:tracking by default

base/threading/thread.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/threading/thread.h"
 
 #include "base/lazy_instance.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/thread_local.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 134 matching lines @@
   {
     // The message loop for this thread.
     MessageLoop message_loop(startup_data_->options.message_loop_type);
 
     // Complete the initialization of our Thread object.
     thread_id_ = PlatformThread::CurrentId();
     PlatformThread::SetName(name_.c_str());
     ANNOTATE_THREAD_NAME(name_.c_str());  // Tell the name to race detector.
     message_loop.set_thread_name(name_);
     message_loop_ = &message_loop;
+#if defined(TRACK_ALL_TASK_OBJECTS)
     tracked_objects::ThreadData::InitializeThreadContext(name_);
+#endif  // TRACK_ALL_TASK_OBJECTS
 
     // Let the thread do extra initialization.
     // Let's do this before signaling we are started.
     Init();
 
     startup_data_->event.Signal();
     // startup_data_ can't be touched anymore since the starting thread is now
     // unlocked.
 
     Run(message_loop_);
 
     // Let the thread do extra cleanup.
     CleanUp();
 
     // Assert that MessageLoop::Quit was called by ThreadQuitTask.
     DCHECK(GetThreadWasQuitProperly());
 
     // We can't receive messages anymore.
     message_loop_ = NULL;
   }
   thread_id_ = kInvalidThreadId;
 }
 
 }  // namespace base