Revert of Change base::Value::ListStorage to std::vector<base::Value>

components/ntp_snippets/content_suggestions_service.cc

Index: components/ntp_snippets/content_suggestions_service.cc
diff --git a/components/ntp_snippets/content_suggestions_service.cc b/components/ntp_snippets/content_suggestions_service.cc
index 9d4955e1e2872eda23d76479904ebb3e65b90805..cb54bbb7174ea315ab0aadb7be7a8bc94160f247 100644
--- a/components/ntp_snippets/content_suggestions_service.cc
+++ b/components/ntp_snippets/content_suggestions_service.cc
@@ -606,10 +606,10 @@
 
   const base::ListValue* list =
       pref_service_->GetList(prefs::kDismissedCategories);
-  for (const base::Value& entry : *list) {
+  for (const std::unique_ptr<base::Value>& entry : *list) {
     int id = 0;
-    if (!entry.GetAsInteger(&id)) {
-      DLOG(WARNING) << "Invalid category pref value: " << entry;
+    if (!entry->GetAsInteger(&id)) {
+      DLOG(WARNING) << "Invalid category pref value: " << *entry;
       continue;
     }