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This is preparation for changing layout test test dump to innerText.

js-test.js currently adds message blocks like:

<div>message<br></div>

In most cases, this is rendered in the same way as <div>message</div>,
and also produces the same text dump as it. However, this results in
an additional '\n' in innerText.

Hence, to make switching to innerText easier, this patch removes the
trailing <br> from js-test.js text dump.

Per-file changes (in third_party/WebKit/LayoutTests/):
- resources/js-test.js: actual change
- Almost all *-expected.txt are rebaselines that differ only by adding
  or removing empty lines
- The only exceptions are in flag-specific/enable-blink-features=LayoutNG
  where a few redundant flag-specific baselines are removed

Bug: 887148
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I45ab0ac52fc74ae0fab0c5e1f05be7b915dfe384
Reviewed-on: https://chromium-review.googlesource.com/1247196
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595364}