Revert "[go/perfbot-sheriff] disable a memory.desktop story."

This reverts commit da3002fb.

Reason for revert: Relanding after https://chromium-review.googlesource.com/c/chromium/src/+/1626991 which should fix the test.

Original change's description:
> [go/perfbot-sheriff] disable a memory.desktop story.
> 
> TBR=perezju@chromium.org
> 
> Bug: 965066
> Change-Id: Ie2c498aeec8d96f14402a99e7984817eaedec9c2
> NOTRY: True
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1620125
> Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
> Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#661396}

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

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

Bug: 965066
Change-Id: Id650e8d0296a63eacdf2870a1b258177669ffd15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628009Reviewed-by: oysteine <oysteine@chromium.org>
Commit-Queue: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663179}

tools/perf/expectations.config

@@ -180,9 +180,6 @@ 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: memory.desktop
-crbug.com/965066 [ Win_10 ] memory.desktop/TrivialFullscreenVideoPageSharedPageState [ 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 ]