Gets rid of unused '_todel' mock-record tracker.
Gets rid of unused '_todel' mock-record tracker.

CATCH-FACT/SolrSearch-VB,micongrin/plugin_SolrSearch-WMI,anuragji/SolrSearch,CATCH-FACT/SolrSearch-VB,anuragji/SolrSearch,anuragji/SolrSearch,micongrin/plugin_SolrSearch-WMI,CATCH-FACT/SolrSearch-VB,scholarslab/SolrSearch,anuragji/SolrSearch,CATCH-FACT/SolrSearch-VB,scholarslab/SolrSearch,scholarslab/SolrSearch,scholarslab/SolrSearch,micongrin/plugin_SolrSearch-WMI