[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/+/1592053Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#655621}

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 ]