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The :focus-visible tests were modified recently, but that introduced
some leaks that were detected by "WebKit Linux Leak" bot.

The tests that were failing are using test_driver.click().
This patch modifies the tests, so they pass without issues when
passing --enable-leak-detection to tools/run_web_tests.py
in a release build.

Bug: 1163172
Change-Id: I9b8b1d0459bf7598fc3330495f3cc3ea95d36dae
Cq-Include-Trybots: luci.chromium.try:layout_test_leak_detection,leak_detection_linux
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617818Reviewed-by: Javier Fernandez <jfernandez@igalia.com>
Commit-Queue: Manuel Rego <rego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#841432}