Convert editing/style/style-3998892-fix.html to use w3c test harness
This patch converts "editing/style/style-3998892-fix.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/0d1fad9e3b073f1a4da0184392f3fe79f2f618b7
Cr-Commit-Position: refs/heads/master@{#408016}