RefCounted types should not have public destructors, delegate cleanup

content/public/browser/download_manager_delegate.cc

 // Copyright (c) 2012 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 "content/public/browser/download_manager_delegate.h"
 
 #include "content/public/browser/download_id.h"
 #include "content/public/browser/download_item.h"
 
 namespace content {
 
-DownloadManagerDelegate::~DownloadManagerDelegate() {
-}
-
 DownloadId DownloadManagerDelegate::GetNextId() {
   return DownloadId::Invalid();
 }
 
 bool DownloadManagerDelegate::ShouldStartDownload(int32 download_id) {
   return true;
 }
 
 FilePath DownloadManagerDelegate::GetIntermediatePath(
     const DownloadItem& item,
@@ skipping 18 matching lines @@
 }
 
 bool DownloadManagerDelegate::ShouldOpenDownload(DownloadItem* item) {
   return true;
 }
 
 bool DownloadManagerDelegate::GenerateFileHash() {
   return false;
 }
 
+DownloadManagerDelegate::~DownloadManagerDelegate() {}
+
 }  // namespace content