Switch SupportsUserData uses to use unique_ptr.

chrome/browser/download/download_status_updater.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 "chrome/browser/download/download_status_updater.h"
 
 #include <stdint.h>
 
 #include <vector>
 
@@ skipping 21 matching lines @@
  public:
   static bool Get(content::DownloadItem* item) {
     return item->GetUserData(kKey) != NULL;
   }
 
   static void Clear(content::DownloadItem* item) {
     item->RemoveUserData(kKey);
   }
 
   explicit WasInProgressData(content::DownloadItem* item) {
-    item->SetUserData(kKey, this);
+    item->SetUserData(kKey, base::WrapUnique(this));
   }
 
  private:
   static const char kKey[];
   DISALLOW_COPY_AND_ASSIGN(WasInProgressData);
 };
 
 const char WasInProgressData::kKey[] =
   "DownloadItem DownloadStatusUpdater WasInProgressData";
 
@@ skipping 89 matching lines @@
     float progress = 0;
     int download_count = 0;
     GetProgress(&progress, &download_count);
     linux_ui->SetDownloadCount(download_count);
     linux_ui->SetProgressFraction(progress);
   }
 #endif
   // TODO(avi): Implement for Android?
 }
 #endif