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Configure Views HTML authentication and tab modal confirm dialogs to be
closed when interstitial WebUI is displayed (e.g. for SSL warnings prior
to page load).

This is effectively a no-op for these dialogs, but is desirable so that
all web contents modal dialogs have consistently configured behavior;
these dialogs are already closed at load start time which occurs before
interstitial WebUI is displayed.

BUG=240575
R=sky@chromium.org

Review URL: https://codereview.chromium.org/23903025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222130 0039d316-1c4b-4281-b951-d872f2087c98