[tools/perf] Re-enable system_health.memory_desktop/load:news:bbc:2018

Bug: 999004
Change-Id: I9a95be621b29e398509bdcd3cfadf87902a399a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1789306Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695175}

tools/perf/expectations.config

@@ -339,8 +339,6 @@ crbug.com/942952 [ chromeos ] system_health.memory_desktop/browse:news:hackernew
 crbug.com/959418 [ chromeos ] system_health.memory_desktop/long_running:tools:gmail-background [ Skip ]
 crbug.com/959418 [ chromeos ] system_health.memory_desktop/load:games:spychase:2018 [ Skip ]
 crbug.com/959418 [ chromeos ] system_health.memory_desktop/long_running:tools:gmail-foreground [ Skip ]
-crbug.com/999004 [ linux ] system_health.memory_desktop/load:news:bbc:2018 [ Skip ]
-crbug.com/999004 [ mac ] system_health.memory_desktop/load:news:bbc:2018 [ Skip ]
 
 # Benchmark: system_health.memory_mobile
 crbug.com/914390 [ android-nexus-5 ] system_health.memory_mobile/browse:chrome:newtab [ Skip ]