Revert "Suppress timed out test (browse:news:washingtonpost)"

This reverts commit 5f450a3.

Reason for revert: Build went green before suppression was needed.

Original change's description:
> Suppress timed out test (browse:news:washingtonpost)
> 
> Skip system_health.memory_mobile/browse:news:washingtonpost:2019 to prevent time out on android-go
> 
> TBR=jonross@chromium.org
> 
> Bug: 1129885
> Change-Id: I8c6a6dd0e17a2256a0acee15d60dc8a9b154bd5d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418321
> Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
> Reviewed-by: Jonathan Ross <jonross@chromium.org>
> Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#808488}

TBR=jonross@chromium.org,behdadb@chromium.org

Change-Id: I3a205cbe1d3e3b239564d308d670a694031e2759
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1129885
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419571
Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808511}

tools/perf/expectations.config

@@ -380,7 +380,6 @@ crbug.com/1112337 [ android ] system_health.memory_mobile/browse:news:cricbuzz:2
 crbug.com/1113921 [ android-go ] system_health.memory_mobile/load:tools:dropbox:2019 [ Skip ]
 crbug.com/1128019 [ android-pixel-2 ] system_health.memory_mobile/load:tools:dropbox:2019 [ Skip ]
 crbug.com/1128019 [ android-nexus-5x ] system_health.memory_mobile/load:tools:dropbox:2019 [ Skip ]
-crbug.com/1129885 [ android-go ] system_health.memory_mobile/browse:news:washingtonpost:2019 [ Skip ]
 
 # Benchmark: tab_switching.typical_25
 crbug.com/747026 [ mac ] tab_switching.typical_25/multitab:misc:typical24 [ Skip ]