Remove more usage of the base::ListValue::Append(Value*) overload.

content/renderer/devtools/devtools_agent.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 "content/renderer/devtools/devtools_agent.h"
 
 #include <stddef.h>
 
 #include <map>
 
@@ skipping 309 matching lines @@
   if (!is_attached_)
     return;
 
   std::unique_ptr<base::DictionaryValue> response(new base::DictionaryValue());
   response->SetInteger("id", call_id);
   std::unique_ptr<base::DictionaryValue> result(new base::DictionaryValue());
   std::unique_ptr<base::ListValue> errors(new base::ListValue());
 
   bool failed = false;
   for (const auto& error : debug_info.errors) {
-    base::DictionaryValue* error_value = new base::DictionaryValue();
-    errors->Append(error_value);
+    std::unique_ptr<base::DictionaryValue> error_value(
+        new base::DictionaryValue());
     error_value->SetString("message", error.message);
     error_value->SetBoolean("critical", error.critical);
     error_value->SetInteger("line", error.line);
     error_value->SetInteger("column", error.column);
     if (error.critical)
       failed = true;
+    errors->Append(std::move(error_value));
   }
 
   WebString url = frame_->GetWebFrame()->document().manifestURL().string();
   result->SetString("url", url);
   if (!failed)
     result->SetString("data", debug_info.raw_data);
   result->Set("errors", errors.release());
   response->Set("result", result.release());
 
   std::string json_message;
   base::JSONWriter::Write(*response, &json_message);
   SendChunkedProtocolMessage(this, routing_id(), session_id, call_id,
                              json_message, std::string());
 }
 
 }  // namespace content