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This patch changes "remove-list-from-range-selection.html" to utilize
|selection_test()| for ease of maintenance.

Note: "remove-list-from-range-selection.html" is failed on layout_ng bot
du by pixel test.

Bug: 679977, 636993
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I1c3257701ae53ceacbb651ca544925d982a30e5d
Reviewed-on: https://chromium-review.googlesource.com/991625
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547989}