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It is no longer called. Only 1 real implementation existed.

Delete SetAsInterstitial from ContentSettingsAgent, it's unused now.

Change-Id: I995a6944115e192a4c213b8f3689130414458927
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2397110
Commit-Queue: Fergal Daly <fergal@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814115}