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

components/ntp_snippets/content_suggestions_service.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/ntp_snippets/content_suggestions_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <set>
 #include <utility>
@@ skipping 588 matching lines @@
   }
 }
 
 void ContentSuggestionsService::RestoreDismissedCategoriesFromPrefs() {
   // This must only be called at startup.
   DCHECK(dismissed_providers_by_category_.empty());
   DCHECK(providers_by_category_.empty());
 
   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;
     }
 
     // When the provider is registered, it will be stored in this map.
     dismissed_providers_by_category_[Category::FromIDValue(id)] = nullptr;
   }
 }
 
 void ContentSuggestionsService::StoreDismissedCategoriesToPrefs() {
   base::ListValue list;
   for (const auto& category_provider_pair : dismissed_providers_by_category_) {
     list.AppendInteger(category_provider_pair.first.id());
   }
 
   pref_service_->Set(prefs::kDismissedCategories, list);
 }
 
 }  // namespace ntp_snippets