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

components/policy/core/common/schema.cc

Index: components/policy/core/common/schema.cc
diff --git a/components/policy/core/common/schema.cc b/components/policy/core/common/schema.cc
index 31dae8e6daa8faa21de5c85cdecebb8d1f27c3cd..330848cc732364817b5ed9558703a7083a0a4be6 100644
--- a/components/policy/core/common/schema.cc
+++ b/components/policy/core/common/schema.cc
@@ -619,7 +619,7 @@
     int value;
     for (base::ListValue::const_iterator it = possible_values->begin();
          it != possible_values->end(); ++it) {
-      if (!it->GetAsInteger(&value)) {
+      if (!(*it)->GetAsInteger(&value)) {
         *error = "Invalid enumeration member type";
         return false;
       }
@@ -631,7 +631,7 @@
     std::string value;
     for (base::ListValue::const_iterator it = possible_values->begin();
          it != possible_values->end(); ++it) {
-      if (!it->GetAsString(&value)) {
+      if (!(*it)->GetAsString(&value)) {
         *error = "Invalid enumeration member type";
         return false;
       }
@@ -826,7 +826,10 @@
   } else if (value.GetAsList(&list)) {
     for (base::ListValue::const_iterator it = list->begin(); it != list->end();
          ++it) {
-      if (!GetItems().Validate(*it, StrategyForNextLevel(strategy), error_path,
+      if (!*it ||
+          !GetItems().Validate(**it,
+                               StrategyForNextLevel(strategy),
+                               error_path,
                                error)) {
         // Invalid list item was detected.
         AddListIndexPrefixToPath(it - list->begin(), error_path);