Switch SupportsUserData uses to use unique_ptr.

chrome/browser/safe_browsing/download_feedback_service.cc

Index: chrome/browser/safe_browsing/download_feedback_service.cc
diff --git a/chrome/browser/safe_browsing/download_feedback_service.cc b/chrome/browser/safe_browsing/download_feedback_service.cc
index 379bcda41e5c2bc496a194946988fbc83558cf8f..7be796619acec2f83d7a89d5612c916624484be1 100644
--- a/chrome/browser/safe_browsing/download_feedback_service.cc
+++ b/chrome/browser/safe_browsing/download_feedback_service.cc
@@ -9,6 +9,7 @@
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/supports_user_data.h"
 #include "base/task_runner.h"
@@ -62,9 +63,8 @@ void DownloadFeedbackPings::CreateForDownload(
     content::DownloadItem* download,
     const std::string& ping_request,
     const std::string& ping_response) {
-  DownloadFeedbackPings* pings = new DownloadFeedbackPings(ping_request,
-                                                           ping_response);
-  download->SetUserData(kPingKey, pings);
+  download->SetUserData(kPingKey, base::MakeUnique<DownloadFeedbackPings>(
+                                      ping_request, ping_response));
 }
 
 // static