Reenable dummy_benchmark.stable_benchmark_1 on windows.

Having this disabled is causing performance_test_suite to
consistently fail on functional test bots b/c it tries to
run a shard w/o running tests.

Bug: 848900
Change-Id: I05bcef1b3f5b9e42238e533a020a0acaddb6369b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862255
Commit-Queue: John Budorick <jbudorick@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Auto-Submit: John Budorick <jbudorick@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706064}

tools/perf/expectations.config

@@ -110,9 +110,6 @@ crbug.com/702319 [ android-nexus-5x ] blink_perf.shadow_dom/* [ Skip ]
 # Benchmark: dromaeo
 crbug.com/984578 [ linux ] dromaeo/http://dromaeo.com?dom-modify [ Skip ]
 
-# Benchmark: dummy_benchmark
-crbug.com/848900 [ win ] dummy_benchmark.stable_benchmark_1/dummy_page.html [ Skip ]
-
 # Benchmark: blink_perf.svg
 crbug.com/736817 [ android-nexus-5x ] blink_perf.svg/SvgCubics.html [ Skip ]
 crbug.com/736817 [ android-nexus-5x ] blink_perf.svg/Debian.html [ Skip ]