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This patch converts some layout tests with testharness to reduce usage
of deprecated js-test.js.

It's also a preparation for using Element.innerText as layout test text
dump to avoid confusiong text dumps. These tests contain <option> with
text like "failure", which doesn't appear in old text dump but appears in
innerText. By converting with testharness, we don't have such confusing
text dumps.

Bug: 887148
Change-Id: I38cc38cb395318bb9ddd38d655c99bd4f47bb846
Reviewed-on: https://chromium-review.googlesource.com/c/1314131Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604978}