Convert editing/pasteboard/merge-end-blockquote.html to use w3c test harness
This patch converts "editing/pasteboard/merge-end-blockquote.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/5e7cb1df177023ec21114c253c2516e1ff341c10
Cr-Commit-Position: refs/heads/master@{#407760}