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

base/cancellation_flag.h

-// 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.
 
 #ifndef BASE_CANCELLATION_FLAG_H_
 #define BASE_CANCELLATION_FLAG_H_
 #pragma once
 
 #include "base/atomicops.h"
-#include "base/platform_thread.h"
+#include "base/threading/platform_thread.h"
 
 namespace base {
 
 // CancellationFlag allows one thread to cancel jobs executed on some worker
 // thread. Calling Set() from one thread and IsSet() from a number of threads
 // is thread-safe.
 //
 // This class IS NOT intended for synchronization between threads.
 class CancellationFlag {
  public:
@@ skipping 13 matching lines @@
 #if !defined(NDEBUG)
   PlatformThreadId set_on_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(CancellationFlag);
 };
 
 }  // namespace base
 
 #endif  // BASE_CANCELLATION_FLAG_H_