GitLab

Add Document and DocumentFragment as inputs on both sanitize and
sanitizeToString methods.

Bug: 1116418
Change-Id: I06cd10dde9a5ca637140f7c4a71a302faa77abc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2487085Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Yifan Luo <lyf@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822147}