Convert editing/selection/move-by-line-cycles-in-table.html with selection_test

This patch converts the web test with selection_test() to promote usage
of W3C test harness, and also to ease the implementation of hit test
based up and down caret movements (http://bit.ly/2WB70oR).

Bug: 679977
Change-Id: I7b70ee143ec85dd1d5984375cb15f4d9e71d43e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1559155
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#651194}
2 files changed