Move platform_thread to base/threading and put in the base namespace. I left a
stub and "using" declarations in the old location to avoid having to change the
entire project at once.

TEST=it compiles
BUG=none
Review URL: http://codereview.chromium.org/6001010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@70342 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/lazy_instance.cc b/base/lazy_instance.cc
index eb71061..32bb788 100644
--- a/base/lazy_instance.cc
+++ b/base/lazy_instance.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
@@ -7,7 +7,7 @@
 #include "base/at_exit.h"
 #include "base/atomicops.h"
 #include "base/basictypes.h"
-#include "base/platform_thread.h"
+#include "base/threading/platform_thread.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 
 namespace base {