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This patch removes U+FFFC from characters to have zero-width.

LayoutNG does not have this specialization, and Edge and Gecko
do not make U+FFFC zero-width either.

As part of the investigation, zero-width-characters.html was
changed to testharness.js.

Bug: 636993
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I278778bd030d87f6691de0e217b53e5cd62287a1
Reviewed-on: https://chromium-review.googlesource.com/1110182Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570080}