Switch SupportsUserData uses to use unique_ptr.

chrome/browser/download/download_status_updater_mac.mm

Index: chrome/browser/download/download_status_updater_mac.mm
diff --git a/chrome/browser/download/download_status_updater_mac.mm b/chrome/browser/download/download_status_updater_mac.mm
index 574553b641ce23f2d825c80d0a9e3f852405ad0f..ad8a30ec20f57520da1d799c5e2607590c449533 100644
--- a/chrome/browser/download/download_status_updater_mac.mm
+++ b/chrome/browser/download/download_status_updater_mac.mm
@@ -7,6 +7,7 @@
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/mac/sdk_forward_declarations.h"
+#include "base/memory/ptr_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/supports_user_data.h"
 #import "chrome/browser/ui/cocoa/dock_icon.h"
@@ -161,8 +162,9 @@ void CreateNSProgress(content::DownloadItem* download) {
 
   [progress publish];
 
-  download->SetUserData(&kCrNSProgressUserDataKey,
-                        new CrNSProgressUserData(progress, destination_path));
+  download->SetUserData(
+      &kCrNSProgressUserDataKey,
+      base::MakeUnique<CrNSProgressUserData>(progress, destination_path));
 }
 
 void UpdateNSProgress(content::DownloadItem* download,