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This involved updating the test fixture to use a different
mechanism because the execution of the JS script bodies via
ChromeEarlGrey injection hangs because of JS execution halts
while the dialogs are displayed.  Instead, there is now a
tappable link on the page that executes the dialog scripts
with a timeout so that the script execution can return while
the dialog is displayed.

Bug: 987646
Change-Id: Ifa90d923360ca03c686d662a7cc34575dff94037
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883137
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Auto-Submit: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710893}