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This is a reland of 7c10d9bb.

We just need to add SlowTest entries for the failing tests (already
done for default)

Original change's description:
> Revert virtual test-suite for streaming-preload.
>
> Causes too many timeout issues for WebKit Linux Trusty MSAN.
>
> This reverts the virtual suite part of [1].
>
> [1] https://crrev.com/7c10d9bbc2c168bc6fd889c523ab8d7e6d48abaa
>
> TBR=leszeks@chromium.org
>
> Bug: 908060
> Change-Id: I50111b8a5dc93a29078a0e9f77feefc1a960bedd
> Reviewed-on: https://chromium-review.googlesource.com/c/1349222
> Reviewed-by: Rune Lillesveen <futhark@chromium.org>
> Commit-Queue: Rune Lillesveen <futhark@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#610589}

TBR=leszeks@chromium.org,futhark@chromium.org

Change-Id: Id7486a144dcf5a93c5c2521d36dec62bc91e34f5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 908060
Reviewed-on: https://chromium-review.googlesource.com/c/1349266Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610601}