Update SupportsUserData uses with unique_ptr.

components/user_prefs/user_prefs.cc

Index: components/user_prefs/user_prefs.cc
diff --git a/components/user_prefs/user_prefs.cc b/components/user_prefs/user_prefs.cc
index 493c50eac77d10e846f80a779bf55bbb39cdf36a..a752c8f8acc56d46895d857a37a2b785147d4088 100644
--- a/components/user_prefs/user_prefs.cc
+++ b/components/user_prefs/user_prefs.cc
@@ -5,6 +5,7 @@
 #include "components/user_prefs/user_prefs.h"
 
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "components/prefs/pref_service.h"
 
@@ -34,7 +35,7 @@ void UserPrefs::Set(base::SupportsUserData* context, PrefService* prefs) {
   DCHECK(context);
   DCHECK(prefs);
   DCHECK(!context->GetUserData(UserDataKey()));
-  context->SetUserData(UserDataKey(), new UserPrefs(prefs));
+  context->SetUserData(UserDataKey(), base::WrapUnique(new UserPrefs(prefs)));
 }
 
 UserPrefs::UserPrefs(PrefService* prefs) : prefs_(prefs) {