Remove use of deprecated base::ListValue::Append(Value*) overload in extensions.

chrome/browser/extensions/api/sync_file_system/sync_file_system_api.cc

Index: chrome/browser/extensions/api/sync_file_system/sync_file_system_api.cc
diff --git a/chrome/browser/extensions/api/sync_file_system/sync_file_system_api.cc b/chrome/browser/extensions/api/sync_file_system/sync_file_system_api.cc
index 0fdc9a6b63c6ba2d1fda168b06ccacd3f6f5590e..c89dad722b3a2f13a2a048938597b2adb3cfeeac 100644
--- a/chrome/browser/extensions/api/sync_file_system/sync_file_system_api.cc
+++ b/chrome/browser/extensions/api/sync_file_system/sync_file_system_api.cc
@@ -275,8 +275,7 @@ void SyncFileSystemGetFileStatusesFunction::DidGetFileStatus(
   std::unique_ptr<base::ListValue> status_array(new base::ListValue());
   for (URLToStatusMap::iterator it = file_sync_statuses_.begin();
        it != file_sync_statuses_.end(); ++it) {
-    base::DictionaryValue* dict = new base::DictionaryValue();
-    status_array->Append(dict);
+    std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
 
     storage::FileSystemURL url = it->first;
     SyncStatusCode file_error = it->second.first;
@@ -290,6 +289,8 @@ void SyncFileSystemGetFileStatusesFunction::DidGetFileStatus(
     if (file_error == sync_file_system::SYNC_STATUS_OK)
       continue;
     dict->SetString("error", ErrorToString(file_error));
+
+    status_array->Append(std::move(dict));
   }
   SetResult(std::move(status_array));