Convert editing/execCommand/indent-selection.html to use w3c test harness
This patch converts "editing/execCommand/indent-selection.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/df54426c9c46217a8b04b00669d3dcf77f58bb2e
Cr-Commit-Position: refs/heads/master@{#407406}