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When Delayed Warnings feature detects and delays an interstitial, Client
Side Detection could send another phishy verdict for the same URL. This
causes the interstitial to be undelayed immediately. This CL changes the
CSD behavior so that it never checks if a Delayed Warning observer is
attached to a tab which only happens if a warning is being delayed.

This is manually tested to work both on official and non-official
builds. A follow up CL will add browser tests.

Bug: 1118192
Test: Manual
Change-Id: I418910c35ec692ef23e4295a6b59092cb55d5968
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364213Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799881}