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

components/data_reduction_proxy/core/common/data_reduction_proxy_event_store.cc

 // Copyright 2014 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 "components/data_reduction_proxy/core/common/data_reduction_proxy_event_store.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 #include <vector>
@@ skipping 36 matching lines @@
 const StringToConstant kDataReductionProxyBypassActionTypeTable[] = {
 #define BYPASS_ACTION_TYPE(label, value)                       \
   { #label, data_reduction_proxy::BYPASS_ACTION_TYPE_##label } \
   ,
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_bypass_action_list.h"
 #undef BYPASS_ACTION_TYPE
 };
 
 std::string JoinListValueStrings(base::ListValue* list_value) {
   std::vector<std::string> values;
-  for (auto it = list_value->begin(); it != list_value->end(); ++it) {
+  for (const auto& value : *list_value) {
     std::string value_string;
-    base::Value* value = *it;
     if (!value->GetAsString(&value_string))
       return std::string();
 
     values.push_back(value_string);
   }
 
   return base::JoinString(values, ";");
 }
 
 }  // namespace
@@ skipping 200 matching lines @@
       last_bypass->SetString("url", clean_url.spec());
     }
   }
 
   std::string json;
   base::JSONWriter::Write(*last_bypass.get(), &json);
   return json;
 }
 
 }  // namespace data_reduction_proxy