Move base::ThreadLocalPlatform to base::internal::ThreadLocalPlatform.

base/thread_local_posix.cc

 // Copyright (c) 2006-2008 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.
 
 #include "base/thread_local.h"
 
 #include <pthread.h>
 
 #include "base/logging.h"
 
 namespace base {
 
+namespace internal {
+
 // static
 void ThreadLocalPlatform::AllocateSlot(SlotType& slot) {
   int error = pthread_key_create(&slot, NULL);
   CHECK_EQ(error, 0);
 }
 
 // static
 void ThreadLocalPlatform::FreeSlot(SlotType& slot) {
   int error = pthread_key_delete(slot);
   DCHECK(error == 0);
 }
 
 // static
 void* ThreadLocalPlatform::GetValueFromSlot(SlotType& slot) {
   return pthread_getspecific(slot);
 }
 
 // static
 void ThreadLocalPlatform::SetValueInSlot(SlotType& slot, void* value) {
   int error = pthread_setspecific(slot, value);
   CHECK_EQ(error, 0);
 }
 
+}  // namespace internal
+
 }  // namespace base