Reland "[Telemetry] Re-enable media stories to try speculative fix."

This is a reland of d3107b1f

My fix here went through: https://chromium-review.googlesource.com/c/catapult/+/1592813

TBR=dalecurtis@chromium.org
NOTRY=True

Original change's description:
> [Telemetry] Re-enable media stories to try speculative fix.
>
> I have a speculative fix at https://chromium-review.googlesource.com/c/catapult/+/1592032
>
> NOTRY=true
> TBR=sullivan@chromium.org
>
> Bug: 957977
> Change-Id: Ib753d6a060ee366c9f9e1e3bcd2b9e92aeacfc4a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1592053
> Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
> Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#655621}

Bug: 957977
Change-Id: I12063860fb0cc5c92e6220e1f49d5f7520721b27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1594617Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656358}

tools/perf/expectations.config

@@ -164,10 +164,6 @@ crbug.com/865400 [ Pixel_2 Android_Webview ] loading.mobile/OLX_3g [ Skip ]
 crbug.com/865400 [ Pixel_2 Android_Webview ] loading.mobile/VoiceMemos_cold_3g [ Skip ]
 crbug.com/919191 [ Nexus5X_Webview ] loading.mobile/OLX_3g [ Skip ]
 
-# Benchmark: media.desktop
-crbug.com/957977 [ Win ] media.desktop/video.html?src=crowd1080.mp4 [ Skip ]
-crbug.com/957977 [ Win ] media.desktop/video.html?src=crowd1080.webm [ Skip ]
-
 # Benchmark: oilpan_gc_times.key_silk_cases
 crbug.com/446332 [ All ] oilpan_gc_times.key_silk_cases/slide_drawer [ Skip ]
 crbug.com/507865 [ All ] oilpan_gc_times.key_silk_cases/polymer_topeka [ Skip ]