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

tools/json_schema_compiler/util.h

 // 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.
 
 #ifndef TOOLS_JSON_SCHEMA_COMPILER_UTIL_H__
 #define TOOLS_JSON_SCHEMA_COMPILER_UTIL_H__
 
 #include <string>
 #include <vector>
 
@@ skipping 16 matching lines @@
 bool GetItemFromList(const ListValue& from, int index, double* out);
 bool GetItemFromList(const ListValue& from, int index, std::string* out);
 bool GetItemFromList(const ListValue& from, int index,
     linked_ptr<base::DictionaryValue>* out);
 bool GetItemFromList(const ListValue& from, int index,
     linked_ptr<any::Any>* out);
 
 // This template is used for types generated by tools/json_schema_compiler.
 template<class T>
 bool GetItemFromList(const ListValue& from, int index, linked_ptr<T>* out) {
-  DictionaryValue* dict;
+  const DictionaryValue* dict;
   if (!from.GetDictionary(index, &dict))
     return false;
   scoped_ptr<T> obj(new T());
   if (!T::Populate(*dict, obj.get()))
     return false;
   *out = linked_ptr<T>(obj.release());
   return true;
 }
 
 // Populates |out| with |list|. Returns false if there is no list at the
@@ skipping 123 matching lines @@
     const scoped_ptr<std::vector<T> >& from) {
   if (from.get())
     return CreateValueFromArray(*from);
   return scoped_ptr<Value>();
 }
 
 }  // namespace util
 }  // namespace json_schema_compiler
 
 #endif // TOOLS_JSON_SCHEMA_COMPILER_UTIL_H__