Correct const accessors in base/values.(h|cc), Part II (ListValue)

tools/json_schema_compiler/util.cc

 // Copyright (c) 2012 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 "tools/json_schema_compiler/any.h"
 #include "tools/json_schema_compiler/util.h"
 
 #include "base/values.h"
 
 namespace json_schema_compiler {
@@ skipping 10 matching lines @@
 bool GetItemFromList(const ListValue& from, int index, double* out) {
   return from.GetDouble(index, out);
 }
 
 bool GetItemFromList(const ListValue& from, int index, std::string* out) {
   return from.GetString(index, out);
 }
 
 bool GetItemFromList(const ListValue& from, int index,
     linked_ptr<any::Any>* out) {
-  Value* value = NULL;
+  const Value* value = NULL;
   if (!from.Get(index, &value))
     return false;
   scoped_ptr<any::Any> any_object(new any::Any());
   any_object->Init(*value);
   *out = linked_ptr<any::Any>(any_object.release());
   return true;
 }
 
 bool GetItemFromList(const ListValue& from, int index,
     linked_ptr<base::DictionaryValue>* out) {
-  DictionaryValue* dict = NULL;
+  const DictionaryValue* dict = NULL;
   if (!from.GetDictionary(index, &dict))
     return false;
   *out = linked_ptr<DictionaryValue>(dict->DeepCopy());
   return true;
 }
 
 void AddItemToList(const int from, base::ListValue* out) {
   out->Append(base::Value::CreateIntegerValue(from));
 }
 void AddItemToList(const bool from, base::ListValue* out) {
   out->Append(base::Value::CreateBooleanValue(from));
 }
 void AddItemToList(const double from, base::ListValue* out) {
   out->Append(base::Value::CreateDoubleValue(from));
 }
 void AddItemToList(const std::string& from, base::ListValue* out) {
   out->Append(base::Value::CreateStringValue(from));
 }
 void AddItemToList(const linked_ptr<base::DictionaryValue>& from,
     base::ListValue* out) {
   out->Append(static_cast<Value*>(from->DeepCopy()));
 }
 void AddItemToList(const linked_ptr<any::Any>& from,
     base::ListValue* out) {
   out->Append(from->value().DeepCopy());
 }
 
 }  // namespace api_util
 }  // namespace extensions