Use std::unique_ptr for base::DictionaryValue and base::ListValue's internal store.

base/json/json_writer.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 "base/json/json_writer.h"
 
 #include <stdint.h>
 
 #include <cmath>
 #include <limits>
@@ skipping 109 matching lines @@
 
     case Value::TYPE_LIST: {
       json_string_->push_back('[');
       if (pretty_print_)
         json_string_->push_back(' ');
 
       const ListValue* list = NULL;
       bool first_value_has_been_output = false;
       bool result = node.GetAsList(&list);
       DCHECK(result);
-      for (ListValue::const_iterator it = list->begin(); it != list->end();
-           ++it) {
-        const Value* value = *it;
+      for (const auto& value : *list) {
         if (omit_binary_values_ && value->GetType() == Value::TYPE_BINARY)
           continue;
 
         if (first_value_has_been_output) {
           json_string_->push_back(',');
           if (pretty_print_)
             json_string_->push_back(' ');
         }
 
         if (!BuildJSONString(*value, depth))
@@ skipping 60 matching lines @@
   }
   NOTREACHED();
   return false;
 }
 
 void JSONWriter::IndentLine(size_t depth) {
   json_string_->append(depth * 3U, ' ');
 }
 
 }  // namespace base