Move platform_thread to base/threading and put in the base namespace. I left ...

base/tools_sanity_unittest.cc

Index: base/tools_sanity_unittest.cc
===================================================================
--- base/tools_sanity_unittest.cc	(revision 70328)
+++ base/tools_sanity_unittest.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 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.
 
@@ -7,6 +7,8 @@
 #include "base/thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+namespace base {
+
 namespace {
 
 // We use caps here just to ensure that the method name doesn't interfere with
@@ -136,3 +138,5 @@
   delete thread1;
   delete thread2;
 }
+
+}  // namespace base