Switch SupportsUserData uses to use unique_ptr.

chrome/browser/download/download_history.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.
 
 // DownloadHistory manages persisting DownloadItems to the history service by
 // observing a single DownloadManager and all its DownloadItems using an
 // AllDownloadItemNotifier.
 //
 // DownloadHistory decides whether and when to add items to, remove items from,
 // and update items in the database. DownloadHistory uses DownloadHistoryData to
@@ skipping 13 matching lines @@
 // DownloadHistory to prevent use-after-free bugs.
 // ChromeDownloadManagerDelegate owns DownloadHistory, and deletes it in
 // Shutdown(), which is called by DownloadManagerImpl::Shutdown() after all
 // DownloadItems are destroyed.
 
 #include "chrome/browser/download/download_history.h"
 
 #include <utility>
 
 #include "base/macros.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "components/history/content/browser/download_conversions.h"
 #include "components/history/core/browser/download_database.h"
 #include "components/history/core/browser/download_row.h"
 #include "components/history/core/browser/history_service.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/download_manager.h"
 #include "extensions/features/features.h"
@@ skipping 26 matching lines @@
 
   static const DownloadHistoryData* Get(const content::DownloadItem* item) {
     const base::SupportsUserData::Data* data = item->GetUserData(kKey);
     return (data == NULL) ? NULL
                           : static_cast<const DownloadHistoryData*>(data);
   }
 
   explicit DownloadHistoryData(content::DownloadItem* item)
       : state_(NOT_PERSISTED),
         was_restored_from_history_(false) {
-    item->SetUserData(kKey, this);
+    item->SetUserData(kKey, base::WrapUnique(this));
   }
 
   ~DownloadHistoryData() override {}
 
   PersistenceState state() const { return state_; }
   void SetState(PersistenceState s) { state_ = s; }
 
   bool was_restored_from_history() const { return was_restored_from_history_; }
   void set_was_restored_from_history(bool value) {
     was_restored_from_history_ = value;
@@ skipping 405 matching lines @@
 }
 
 void DownloadHistory::RemoveDownloadsBatch() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   IdSet remove_ids;
   removing_ids_.swap(remove_ids);
   history_->RemoveDownloads(remove_ids);
   for (Observer& observer : observers_)
     observer.OnDownloadsRemoved(remove_ids);
 }