Update SupportsUserData uses with unique_ptr.

chrome/browser/metrics/renderer_uptime_web_contents_observer.cc

 // Copyright 2017 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/metrics/renderer_uptime_web_contents_observer.h"
 
+#include "base/memory/ptr_util.h"
 #include "chrome/browser/metrics/renderer_uptime_tracker.h"
 #include "content/public/browser/render_process_host.h"
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(metrics::RendererUptimeWebContentsObserver);
 
 namespace metrics {
 
 RendererUptimeWebContentsObserver::RendererUptimeWebContentsObserver(
     content::WebContents* web_contents)
     : content::WebContentsObserver(web_contents) {}
 
 // static
 RendererUptimeWebContentsObserver*
 RendererUptimeWebContentsObserver::CreateForWebContents(
     content::WebContents* web_contents) {
   DCHECK(web_contents);
 
   RendererUptimeWebContentsObserver* observer = FromWebContents(web_contents);
   if (!observer) {
     observer = new RendererUptimeWebContentsObserver(web_contents);
-    web_contents->SetUserData(UserDataKey(), observer);
+    web_contents->SetUserData(UserDataKey(), base::WrapUnique(observer));
   }
   return observer;
 }
 
 void RendererUptimeWebContentsObserver::DocumentAvailableInMainFrame() {
   RendererUptimeTracker::Get()->OnLoadInMainFrame(
       web_contents()->GetRenderProcessHost()->GetID());
 }
 
 }  // namespace metrics