Convert editing/insert-div-019.html to use w3c test harness
This patch converts "editing/insert-div-019.html" to use w3c test harness to
simplify test files.
This patch is a preparation of getting rid of grammar checking feature.
BUG=
619452
TEST=n/a; this patch changes a test file
Committed:
https://crrev.com/b595c05e06799f436fabe62e1ef026f8697c57ee
Cr-Commit-Position: refs/heads/master@{#407425}