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This function was only used for overlay interstitial, and is dead code
now.

Bug: 1076947, 1077074
Change-Id: Ieb208b0c617852cc8f74402ffed89d02d4e7219a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2202675
Commit-Queue: Carlos IL <carlosil@chromium.org>
Commit-Queue: Nasko Oskov <nasko@chromium.org>
Auto-Submit: Carlos IL <carlosil@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769048}