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

chrome/browser/policy/managed_bookmarks_policy_handler.cc

Index: chrome/browser/policy/managed_bookmarks_policy_handler.cc
diff --git a/chrome/browser/policy/managed_bookmarks_policy_handler.cc b/chrome/browser/policy/managed_bookmarks_policy_handler.cc
index b112a0ccae13ec84808cf9216b52bec70aeea6ac..dd5fa8bec559ad4bb5e8cda9eaa41aad03e516ad 100644
--- a/chrome/browser/policy/managed_bookmarks_policy_handler.cc
+++ b/chrome/browser/policy/managed_bookmarks_policy_handler.cc
@@ -51,8 +51,7 @@
   // Iterate over the list, and try to find the FolderName.
   for (const auto& el : list) {
     const base::DictionaryValue* dict = NULL;
-    if (!el.GetAsDictionary(&dict))
-      continue;
+    if (!el || !el->GetAsDictionary(&dict)) continue;
 
     std::string name;
     if (dict->GetString(ManagedBookmarksTracker::kFolderName, &name)) {
@@ -69,7 +68,7 @@
   base::ListValue::iterator it = list->begin();
   while (it != list->end()) {
     base::DictionaryValue* dict = NULL;
-    if (!it->GetAsDictionary(&dict)) {
+    if (!*it || !(*it)->GetAsDictionary(&dict)) {
       it = list->Erase(it, NULL);
       continue;
     }