Eliminate the TimerManager by pulling its priority queue into MessageLoop....

base/tracked.h

 // Copyright (c) 2006-2008 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.
 
 //------------------------------------------------------------------------------
 // Tracked is the base class for all tracked objects.  During construction, it
 // registers the fact that an instance was created, and at destruction time, it
 // records that event.  The instance may be tagged with a name, which is refered
 // to as its Location.  The Location is a file and line number, most
 // typically indicated where the object was constructed.  In some cases, as the
@@ skipping 90 matching lines @@
   void SetBirthPlace(const Location& from_here);
 
   // When a task sits around a long time, such as in a timer, or object watcher,
   // this method should be called when the task becomes active, and its
   // significant lifetime begins (and its waiting to be woken up has passed).
   void ResetBirthTime();
 
   bool MissingBirthplace() const;
 
  private:
+#ifdef TRACK_ALL_TASK_OBJECTS
+
   // Pointer to instance were counts of objects with the same birth location
   // (on the same thread) are stored.
   Births* tracked_births_;
   // The time this object was constructed.  If its life consisted of a long
   // waiting period, and then it became active, then this value is generally
   // reset before the object begins it active life.
   Time tracked_birth_time_;
 
+#endif  // TRACK_ALL_TASK_OBJECTS
+
   DISALLOW_COPY_AND_ASSIGN(Tracked);
 };
 
 }  // namespace tracked_objects
 
 #endif  // BASE_TRACKED_H_