Revert "[go/perfbot-sheriff] Disable v8 cnn story."

This reverts commit 2933aeba.

Reason for revert: try enabling issue to see if the bug
is still there.

Original change's description:
> [go/perfbot-sheriff] Disable v8 cnn story.
> 
> NOTRY=true
> R=​ulan@chromium.org
> TBR=ulan@chromium.org
> 
> Bug: 1062438
> Change-Id: If81aed43750d93d5c61b02e22c8e40b9f2acec81
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108060
> Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
> Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#751165}

TBR=ulan@chromium.org,crouleau@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1062438
Change-Id: I6e6d19145fc535393499f2c54087f9a46a74cc6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2128512Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754933}

tools/perf/expectations.config

@@ -381,7 +381,6 @@ crbug.com/1008028 [ desktop ] v8.browsing_desktop/browse:news:hackernews:2018 [
 crbug.com/1009838 [ mac ] v8.browsing_desktop/browse:tools:maps:2019 [ Skip ]
 crbug.com/1008001 [ win ] v8.browsing_desktop/browse:tools:sheets:2019 [ Skip ]
 crbug.com/1023366 [ desktop ] v8.browsing_desktop/browse:media:youtube:2019 [ Skip ]
-crbug.com/1062438 [ win10 ] v8.browsing_desktop/browse:news:cnn:2018 [ Skip ]
 
 # Benchmark v8.browsing_desktop-future
 crbug.com/788796 [ linux ] v8.browsing_desktop-future/browse:media:imgur [ Skip ]