ExtensionFunction: don't pass ownership of base::Value by raw pointer.

chrome/browser/extensions/api/data_reduction_proxy/data_reduction_proxy_api.cc

 // Copyright 2015 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 "chrome/browser/extensions/api/data_reduction_proxy/data_reduction_proxy_api.h"
 
 #include <utility>
 #include <vector>
 
 #include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h"
@@ skipping 45 matching lines @@
         usage->SetString("hostname", site_usage.hostname());
         usage->SetDouble("data_used", site_usage.data_used());
         usage->SetDouble("original_size", site_usage.original_size());
         site_usage_list->Append(std::move(usage));
       }
       connection_usage_list->Append(std::move(site_usage_list));
     }
     data_usage_buckets->Append(std::move(connection_usage_list));
   }
 
-  base::DictionaryValue* result = new base::DictionaryValue();
+  std::unique_ptr<base::DictionaryValue> result(new base::DictionaryValue());
   result->Set("data_usage_buckets", std::move(data_usage_buckets));
-  Respond(OneArgument(result));
+  Respond(OneArgument(std::move(result)));
 }
 
 }  // namespace extensions