Revert 138014 - Base: Don't overwrite the thread id when ThreadMain exits. There's

base/threading/thread.cc

Index: base/threading/thread.cc
===================================================================
--- base/threading/thread.cc	(revision 138017)
+++ base/threading/thread.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.
 
@@ -171,6 +171,7 @@
     // We can't receive messages anymore.
     message_loop_ = NULL;
   }
+  thread_id_ = kInvalidThreadId;
 }
 
 }  // namespace base