Revert of Inlining DeathData accessors, per earlier CR's comment

base/tracked_objects.h

Index: base/tracked_objects.h
diff --git a/base/tracked_objects.h b/base/tracked_objects.h
index c275de9cf08fec85b1990d1d4646b9b4f4287fb9..0f55a079921768b23f10e5de8c032f31d95f7740 100644
--- a/base/tracked_objects.h
+++ b/base/tracked_objects.h
@@ -338,16 +338,14 @@
 
   // Metrics and past snapshots accessors, used only for serialization and in
   // tests.
-  int count() const { return count_; }
-  int32 run_duration_sum() const { return run_duration_sum_; }
-  int32 run_duration_max() const { return run_duration_max_; }
-  int32 run_duration_sample() const { return run_duration_sample_; }
-  int32 queue_duration_sum() const { return queue_duration_sum_; }
-  int32 queue_duration_max() const { return queue_duration_max_; }
-  int32 queue_duration_sample() const { return queue_duration_sample_; }
-  const DeathDataPhaseSnapshot* last_phase_snapshot() const {
-    return last_phase_snapshot_;
-  }
+  int count() const;
+  int32 run_duration_sum() const;
+  int32 run_duration_max() const;
+  int32 run_duration_sample() const;
+  int32 queue_duration_sum() const;
+  int32 queue_duration_max() const;
+  int32 queue_duration_sample() const;
+  const DeathDataPhaseSnapshot* last_phase_snapshot() const;
 
   // Called when the current profiling phase, identified by |profiling_phase|,
   // ends.