Revert 114229 - Revert 113748 - Provide windows notifictaion of thread termination

base/win/dllmain.cc

 // 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.
 
 // Windows doesn't support pthread_key_create's destr_function, and in fact
 // it's a bit tricky to get code to run when a thread exits.  This is
 // cargo-cult magic from http://www.codeproject.com/threads/tls.asp.
 // We are trying to be compatible with both a LoadLibrary style invocation, as
 // well as static linking. This code only needs to be included if we use
 // LoadLibrary, but it hooks into the "standard" set of TLS callbacks that are
@@ skipping 105 matching lines @@
   // call all items.
   // If we are called, it means that some other system is scanning the callbacks
   // and we don't need to do so in DllMain().
   linker_notifications_are_active = true;
   // Note: If some other routine some how plays this same game... we could both
   // decide not to do the scanning <sigh>, but this trick should suppress
   // duplicate calls on Vista, where the runtime takes care of the callbacks,
   // and allow us to do the callbacks on XP, where we are currently devoid of
   // callbacks (due to an explicit LoadLibrary call).
 }