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This is a reland of f5946a0a

It was reverted as 9948fd01

Fix: just exclude ASAN/LSAN bots from running this test.
Context: I was able to produce flaky failures locally, and I
believe these bots are simply timing out because there's now
30 realbox tests. Because these tests are basically just
Javascript, there's really no benefit from running them under
leak/address sanitizer bots (generally only helpful to C++).

Original change's description:
> Local NTP, Realbox: fix navigation to chrome:// URLs
>
> Partially borrowed from https://crrev.com/c/1836021 by Archana Simha <archanasihma@chromium.org>
>
> Bug: 1020025
> Change-Id: I7de22a41d872ec624f25d1633782d27448988c58
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893824
> Commit-Queue: David Bokan <bokan@chromium.org>
> Reviewed-by: David Bokan <bokan@chromium.org>
> Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
> Reviewed-by: Nasko Oskov <nasko@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Auto-Submit: Dan Beam <dbeam@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#715106}

TBR=dcheng@chromium.org,bokan@chromium.org,nasko@chromium.org,mahmadi@chromium.org

Bug: 1020025
Change-Id: I666c372b76a058702c29b88eff765c2cd90c0bb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917982Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715459}