Enable the consistently passing tests in SecurityInterstitialTabHelperTest

This change is part of the effort to re-enable consistently passing
tests across the entire chromium.
If the tests are reasonable, please LGTM and I will proceed to submit
the change.
If the tests are unreasonable, please let me know and I will remove
them.

I do not inspect each individual test case, the idea is to run the
disabled tests on reviver builders
https://ci.chromium.org/ui/p/chromium/g/reviver/builders and use the
aggregated results to decide if a previously disabled test is now
consistently passing.

The following list shows how many times the changed tests were
*consistently* passing on the relevant builders.

components:components_unittests/SecurityInterstitialTabHelperTest.MultipleBlockingPages
        146     fuchsia-fyi-arm64-dbg
        173     fuchsia-fyi-x64-dbg
        192     fuchsia-x64-rel
        110     linux-lacros-tester-rel

Bug: 1380293
Change-Id: Ib54caa6b4641ebdaa5104a43c63f2c8a474458e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4655670
Reviewed-by: Carlos IL <carlosil@chromium.org>
Commit-Queue: Zijie He <zijiehe@google.com>
Reviewed-by: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1164410}