Remove unneeded uses of logging.h in header files.

base/non_thread_safe.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/non_thread_safe.h"
 
-#include "base/platform_thread.h"
-
 // These checks are only done in debug builds.
 #ifndef NDEBUG
 
+#include "base/logging.h"
+
 NonThreadSafe::NonThreadSafe()
     : valid_thread_id_(PlatformThread::CurrentId()) {
 }
 
 bool NonThreadSafe::CalledOnValidThread() const {
   return valid_thread_id_ == PlatformThread::CurrentId();
 }
 
 NonThreadSafe::~NonThreadSafe() {
   DCHECK(CalledOnValidThread());
 }
 
 #endif  // NDEBUG