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

base/lock.cc

 // 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.
 
 // This file is used for debugging assertion support.  The Lock class
 // is functionally a wrapper around the LockImpl class, so the only
 // real intelligence in the class is in the debugging logic.
 
 #if !defined(NDEBUG)
 
 #include "base/lock.h"
 #include "base/logging.h"
 
+using base::PlatformThread;
+using base::PlatformThreadId;
+
 Lock::Lock() : lock_() {
   owned_by_thread_ = false;
   owning_thread_id_ = static_cast<PlatformThreadId>(0);
 }
 
 void Lock::AssertAcquired() const {
   DCHECK(owned_by_thread_);
   DCHECK_EQ(owning_thread_id_, PlatformThread::CurrentId());
 }
 
 void Lock::CheckHeldAndUnmark() {
   DCHECK(owned_by_thread_);
   DCHECK_EQ(owning_thread_id_, PlatformThread::CurrentId());
   owned_by_thread_ = false;
   owning_thread_id_ = static_cast<PlatformThreadId>(0);
 }
 
 void Lock::CheckUnheldAndMark() {
   DCHECK(!owned_by_thread_);
   owned_by_thread_ = true;
   owning_thread_id_ = PlatformThread::CurrentId();
 }
 
 #endif  // NDEBUG