base::ListValue::Append cleanup: pass unique_ptr instead of the released pointer.

chrome/browser/ui/webui/extensions/extension_loader_handler.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 "chrome/browser/ui/webui/extensions/extension_loader_handler.h"
 
+#include <utility>
+
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/path_util.h"
 #include "chrome/browser/extensions/unpacked_installer.h"
@@ skipping 174 matching lines @@
   SourceHighlighter highlighter(manifest, line_number);
   // If the line number is 0, this highlights no regions, but still adds the
   // full manifest.
   highlighter.SetHighlightedRegions(manifest_value.get());
 
   std::unique_ptr<base::DictionaryValue> failure(new base::DictionaryValue());
   failure->Set("path",
                new base::StringValue(prettified_path.LossyDisplayName()));
   failure->Set("error", new base::StringValue(base::UTF8ToUTF16(error)));
   failure->Set("manifest", manifest_value.release());
-  failures_.Append(failure.release());
+  failures_.Append(std::move(failure));
 
   // Only notify the frontend if the frontend UI is ready.
   if (ui_ready_)
     NotifyFrontendOfFailure();
 }
 
 void ExtensionLoaderHandler::NotifyFrontendOfFailure() {
   web_ui()->CallJavascriptFunctionUnsafe(
       "extensions.ExtensionLoader.notifyLoadFailed", failures_);
   failures_.Clear();
 }
 
 }  // namespace extensions