Remove raw base::DictionaryValue::SetWithoutPathExpansion in //chrome

chrome/browser/ui/app_list/arc/arc_app_list_prefs.cc

Index: chrome/browser/ui/app_list/arc/arc_app_list_prefs.cc
diff --git a/chrome/browser/ui/app_list/arc/arc_app_list_prefs.cc b/chrome/browser/ui/app_list/arc/arc_app_list_prefs.cc
index 0c2e812e905712e7e34a4ad15360222534e0e39b..0eb0003ee009540dc588f399d4da57e61fdbd74a 100644
--- a/chrome/browser/ui/app_list/arc/arc_app_list_prefs.cc
+++ b/chrome/browser/ui/app_list/arc/arc_app_list_prefs.cc
@@ -71,8 +71,9 @@ class ScopedArcPrefUpdate : public DictionaryPrefUpdate {
     base::DictionaryValue* dict = DictionaryPrefUpdate::Get();
     base::DictionaryValue* dict_item = nullptr;
     if (!dict->GetDictionaryWithoutPathExpansion(id_, &dict_item)) {
-      dict_item = new base::DictionaryValue();
-      dict->SetWithoutPathExpansion(id_, dict_item);
+      dict->SetWithoutPathExpansion(id_,
+                                    base::MakeUnique<base::DictionaryValue>());
+      dict->GetDictionaryWithoutPathExpansion(id_, &dict_item);
     }
     return dict_item;
   }