Revert 107793 - Fully enable about:tracking by default

base/message_loop.h

Index: base/message_loop.h
===================================================================
--- base/message_loop.h	(revision 107798)
+++ base/message_loop.h	(working copy)
@@ -44,9 +44,11 @@
 class Histogram;
 }
 
+#if defined(TRACK_ALL_TASK_OBJECTS)
 namespace tracked_objects {
 class Births;
 }
+#endif  // defined(TRACK_ALL_TASK_OBJECTS)
 
 // A MessageLoop is used to process events for a particular thread.  There is
 // at most one MessageLoop instance per thread.
@@ -375,22 +377,6 @@
   }
 #endif  // OS_WIN
 
-  // This structure is copied around by value.
-  struct TrackingInfo {
-    TrackingInfo(const tracked_objects::Location& posted_from,
-                 base::TimeTicks delayed_run_time);
-    ~TrackingInfo();
-
-    // Counter for location where the Closure was posted from.
-    tracked_objects::Births* birth_tally;
-
-    // Time this PendingTask was posted.
-    base::TimeTicks time_posted;
-
-    // The time when the task should be run.
-    base::TimeTicks delayed_run_time;
-  };
-
   //----------------------------------------------------------------------------
  protected:
   struct RunState {
@@ -424,7 +410,7 @@
 #endif
 
   // This structure is copied around by value.
-  struct PendingTask : public TrackingInfo {
+  struct PendingTask {
     PendingTask(const base::Closure& task,
                 const tracked_objects::Location& posted_from,
                 base::TimeTicks delayed_run_time,
@@ -437,6 +423,17 @@
     // The task to run.
     base::Closure task;
 
+#if defined(TRACK_ALL_TASK_OBJECTS)
+    // Counter for location where the Closure was posted from.
+    tracked_objects::Births* post_births;
+#endif  // defined(TRACK_ALL_TASK_OBJECTS)
+
+    // Time this PendingTask was posted.
+    base::TimeTicks time_posted;
+
+    // The time when the task should be run.
+    base::TimeTicks delayed_run_time;
+
     // The site this PendingTask was posted from.
     tracked_objects::Location posted_from;