Convert editing/selection/replace-selection-1.html to use w3c test harness
This patch converts "editing/selection/replace-selection-1.html"
to use w3c test harness to simplify test script for improving readability, and
rename to "editing/inserting/insert_html_to_replace_selection.html" since this
test tests "insertHTML" command instead of selection itself.
BUG=n/a
TEST=n/a; no behavior changes
Committed:
https://crrev.com/d42d2828663c573017ed31a801278af3b9bf445c
Cr-Commit-Position: refs/heads/master@{#415562}