Revert 144488 - For unit tests, track additions to AtExitManager and warn.

base/at_exit.cc

Index: base/at_exit.cc
===================================================================
--- base/at_exit.cc	(revision 148403)
+++ base/at_exit.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -79,13 +79,4 @@
   g_top_manager = this;
 }
 
-// static
-AtExitManager* AtExitManager::current() {
-  return g_top_manager;
-}
-
-size_t AtExitManager::CallbackStackSize() const {
-  return stack_.size();
-}
-
 }  // namespace base