See comments in https://chromium-review.googlesource.com/c/chromium/src/+/1145725/4/ios/web/web_state/ui/crw_web_controller.mm#1923

|loadCurrentURL| is triggered when clearing browsing data while an interstitial is visible. Clearing browsing data dismisses the interstitial, and WebInterstitialImpl::DontProceed() triggers the completion callback passed to web::GetWebClient()->AllowCertificateError() upon destruction of WebInterstitialImpl.

|loadCurrentURL| should not be called when clearing browsing data.