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Previously, if a safe browsing error triggered by an extension request
it would result in an invisible interstitial, and cause the extension
to hang. This removes the interstitial so the flagged request gets
cancelled, but the extension doesn't hang.

There was discussion in the bug about adding an API similar to the
one in WebView so the extension can react to the SB flagged request
and decide to bypass it or cancel it. This CL does not implement that,
just fixes the immediate bug.

Bug: 1036603
Change-Id: I0ae89bd9e8e09eb0956d3afab606d90738392c31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527534Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Carlos IL <carlosil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825991}