Switch SupportsUserData uses to use unique_ptr.

ios/web/public/test/test_redirect_observer.mm

Index: ios/web/public/test/test_redirect_observer.mm
diff --git a/ios/web/public/test/test_redirect_observer.mm b/ios/web/public/test/test_redirect_observer.mm
index 35f33bd4a58aea452e89744a144897e64a9d7fae..50146834a340e8fba8296e372b22d5fe04f0de2f 100644
--- a/ios/web/public/test/test_redirect_observer.mm
+++ b/ios/web/public/test/test_redirect_observer.mm
@@ -4,6 +4,7 @@
 
 #include "ios/web/public/test/test_redirect_observer.h"
 
+#include "base/memory/ptr_util.h"
 #include "base/supports_user_data.h"
 #import "ios/web/public/navigation_item.h"
 #import "ios/web/public/navigation_manager.h"
@@ -37,7 +38,7 @@ class TestRedirectObserverUserDataWrapper
   explicit TestRedirectObserverUserDataWrapper(web::WebState* web_state)
       : redirect_observer_(web_state) {
     DCHECK(web_state);
-    web_state->SetUserData(kTestRedirectObserverKey, this);
+    web_state->SetUserData(kTestRedirectObserverKey, base::WrapUnique(this));
   }
 
   web::TestRedirectObserver* redirect_observer() { return &redirect_observer_; }