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This patch converts some layout tests to use testharness instead of
plain text dump or js-test.js.

It is a preparation for crrev.com/c/1243119. The changed tests have
non-trivial text failures with that patch (due to flakes or non-trivial
dependency on js-test.js), so we convert them in this CL to reduce
noise there, and ensure that there are only newline text diffs in the
other CL.

Bug: 887148
Change-Id: I46d7508ddde62e32ddfa421e9975b39b73cc06df
Reviewed-on: https://chromium-review.googlesource.com/1246902
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594581}