bindings: Convert most webidl-*.html tests to testharness.js

This removes the need to have -expected.txt files by default.

Change-Id: Ie04de5c00f32b897bf201fff8828d978f16e0726
Reviewed-on: https://chromium-review.googlesource.com/910850
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Commit-Queue: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Cr-Commit-Position: refs/heads/master@{#535688}
4 files changed