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This patch converts the test to reftest since that test
just confirms repaint after load.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Bug: 708452
Change-Id: Iffc00614c617a64c5f185029014f1d43734fbbca
Reviewed-on: https://chromium-review.googlesource.com/1092610
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566729}