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

extensions/browser/api/system_network/system_network_apitest.cc

 // Copyright 2013 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/memory/ref_counted.h"
 #include "base/strings/stringprintf.h"
 #include "extensions/browser/api/system_network/system_network_api.h"
 #include "extensions/browser/api_test_utils.h"
 #include "extensions/common/test_util.h"
 #include "extensions/shell/test/shell_apitest.h"
@@ skipping 25 matching lines @@
 
   std::unique_ptr<base::Value> result(RunFunctionAndReturnSingleResult(
       socket_function.get(), "[]", browser_context()));
   ASSERT_EQ(base::Value::TYPE_LIST, result->GetType());
 
   // All we can confirm is that we have at least one address, but not what it
   // is.
   base::ListValue* value = static_cast<base::ListValue*>(result.get());
   ASSERT_TRUE(value->GetSize() > 0);
 
-  for (base::ListValue::const_iterator it = value->begin(); it != value->end();
-       ++it) {
-    base::Value* network_interface_value = *it;
-
+  for (const auto& network_interface_value : *value) {
     NetworkInterface network_interface;
     ASSERT_TRUE(NetworkInterface::Populate(*network_interface_value,
                                            &network_interface));
 
     LOG(INFO) << "Network interface: address=" << network_interface.address
               << ", name=" << network_interface.name
               << ", prefix length=" << network_interface.prefix_length;
     ASSERT_NE(std::string(), network_interface.address);
     ASSERT_NE(std::string(), network_interface.name);
     ASSERT_LE(0, network_interface.prefix_length);
   }
 }