RefCounted types should not have public destructors, base/ edition

base/threading/non_thread_safe_impl.cc

 // Copyright (c) 2011 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/threading/non_thread_safe_impl.h"
 
 #include "base/logging.h"
 
 namespace base {
 
+bool NonThreadSafeImpl::CalledOnValidThread() const {
+  return thread_checker_.CalledOnValidThread();
+}
+
 NonThreadSafeImpl::~NonThreadSafeImpl() {
   DCHECK(CalledOnValidThread());
 }
 
-bool NonThreadSafeImpl::CalledOnValidThread() const {
-  return thread_checker_.CalledOnValidThread();
-}
-
 void NonThreadSafeImpl::DetachFromThread() {
   thread_checker_.DetachFromThread();
 }
 
 }  // namespace base