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

chrome/browser/extensions/api/developer_private/developer_private_api.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 "chrome/browser/extensions/api/developer_private/developer_private_api.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 1124 matching lines @@
            file_type_index)) {
     return RespondNow(Error(kCouldNotShowSelectFileDialogError));
   }
 
   AddRef();  // Balanced by FileSelected / FileSelectionCanceled.
   return RespondLater();
 }
 
 void DeveloperPrivateChoosePathFunction::FileSelected(
     const base::FilePath& path) {
-  Respond(OneArgument(new base::StringValue(path.LossyDisplayName())));
+  Respond(OneArgument(
+      base::MakeUnique<base::StringValue>(path.LossyDisplayName())));
   Release();
 }
 
 void DeveloperPrivateChoosePathFunction::FileSelectionCanceled() {
   // This isn't really an error, but we should keep it like this for
   // backward compatability.
   Respond(Error(kFileSelectionCanceled));
   Release();
 }
 
@@ skipping 289 matching lines @@
         update.extension_id, update.command_name, *update.keybinding);
   }
 
   return RespondNow(NoArguments());
 }
 
 
 }  // namespace api
 
 }  // namespace extensions