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Previously on a non-Mac platform when JS dialog is dismissed by user
closing the tab, |DIALOG_BUTTON_CLICKED| is logged. This change
separates the case of the user replying to the dialog with the buttons
vs rejecting it.

Bug: 872795
Change-Id: I4b8781daeb3cead5ee4e975a67f79f94b7fa84e5
Reviewed-on: https://chromium-review.googlesource.com/1164647Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583885}