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This patch changes "merge-start-blockquote.html" to utilize |selection_test()|
for ease of maintenance.

Bug: 679977, 707656
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: Ib8b5d63687c42e9ead5167a11f0a592e19297f84
Reviewed-on: https://chromium-review.googlesource.com/1069965Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561359}