Convert editing/inserting/insert-div-010.html to use w3c test harness
This patch converts "editing/inserting/insert-div-010.html" to use w3c test
harness to simplify test script for improving code health.
BUG=n/a
TEST=n/a; no behavior changes
Committed:
https://crrev.com/ddef9a3aa1c4440f1343795a5c43ca32cf7f1c92
Cr-Commit-Position: refs/heads/master@{#418764}