Switch SupportsUserData uses to use unique_ptr.

ios/chrome/browser/web/network_activity_indicator_tab_helper.mm

 // Copyright 2016 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.
 
 #import "ios/chrome/browser/web/network_activity_indicator_tab_helper.h"
 
+#include "base/memory/ptr_util.h"
 #import "ios/chrome/browser/ui/network_activity_indicator_manager.h"
 #import "ios/web/public/web_state/web_state.h"
 
 DEFINE_WEB_STATE_USER_DATA_KEY(NetworkActivityIndicatorTabHelper);
 
 // static
 void NetworkActivityIndicatorTabHelper::CreateForWebState(
     web::WebState* web_state,
     NSString* tab_id) {
   DCHECK(web_state);
   if (!FromWebState(web_state)) {
-    web_state->SetUserData(UserDataKey(), new NetworkActivityIndicatorTabHelper(
-                                              web_state, tab_id));
+    web_state->SetUserData(
+        UserDataKey(), base::WrapUnique(new NetworkActivityIndicatorTabHelper(
+                           web_state, tab_id)));
   }
 }
 
 NetworkActivityIndicatorTabHelper::NetworkActivityIndicatorTabHelper(
     web::WebState* web_state,
     NSString* tab_id)
     : web::WebStateObserver(web_state), network_activity_key_([tab_id copy]) {}
 
 NetworkActivityIndicatorTabHelper::~NetworkActivityIndicatorTabHelper() {
   Stop();
@@ skipping 13 matching lines @@
 }
 
 void NetworkActivityIndicatorTabHelper::Stop() {
   NetworkActivityIndicatorManager* shared_manager =
       [NetworkActivityIndicatorManager sharedInstance];
   // Verifies that there is a network task associated with this instance
   // before stopping a task, so that this method is idempotent.
   if ([shared_manager numNetworkTasksForGroup:network_activity_key_])
     [shared_manager stopNetworkTaskForGroup:network_activity_key_];
 }