Switch SupportsUserData uses to use unique_ptr.

components/favicon/ios/web_favicon_driver.mm

Index: components/favicon/ios/web_favicon_driver.mm
diff --git a/components/favicon/ios/web_favicon_driver.mm b/components/favicon/ios/web_favicon_driver.mm
index 01f4ff8f62518d0d5ec31952d7f063c36e9fcffb..cba29896466f896d55e946a8e8c0b1588b3578ad 100644
--- a/components/favicon/ios/web_favicon_driver.mm
+++ b/components/favicon/ios/web_favicon_driver.mm
@@ -5,6 +5,7 @@
 #include "components/favicon/ios/web_favicon_driver.h"
 
 #include "base/bind.h"
+#include "base/memory/ptr_util.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "components/favicon/core/favicon_url.h"
 #include "components/favicon/ios/favicon_url_util.h"
@@ -43,9 +44,9 @@ void WebFaviconDriver::CreateForWebState(
   if (FromWebState(web_state))
     return;
 
-  web_state->SetUserData(UserDataKey(),
-                         new WebFaviconDriver(web_state, favicon_service,
-                                              history_service, bookmark_model));
+  web_state->SetUserData(UserDataKey(), base::WrapUnique(new WebFaviconDriver(
+                                            web_state, favicon_service,
+                                            history_service, bookmark_model)));
 }
 
 void WebFaviconDriver::FetchFavicon(const GURL& url) {