Delete outdated sitemap file.
Updated version now in Piper: https://critique.corp.google.com/#review/122362396 Change-Id: If6f8d34532e1b695fbfaf49173df8cb7648ee267
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Updated version now in Piper: https://critique.corp.google.com/#review/122362396 Change-Id: If6f8d34532e1b695fbfaf49173df8cb7648ee267