Move remaining HTMLDocument IDL to Document

All remaining HTMLDocument IDL should be moved to Document:
https://html.spec.whatwg.org/#Document-partial

Behavior matches Safari and Edge.

Bug: 651762
Change-Id: I1cc17e182d0b21bc29e6e64b99e5cd5c8be53781
Reviewed-on: https://chromium-review.googlesource.com/695815
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Rob Buis <rob.buis@samsung.com>
Cr-Commit-Position: refs/heads/master@{#509081}
11 files changed