Disablien browse:news:washingtonpost on N5X webview

The story has been flaky since 3/26.

NOTRY=true
TBR=sullivan@chromium.org,tdresser@chromium.org, perezju@chromium.org

Bug: 954949
Change-Id: I2a60b0faaa723aa5b1dda0e23ab310dc1751714c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1576155
Commit-Queue: Charlie Andrews <charliea@chromium.org>
Reviewed-by: Charlie Andrews <charliea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652845}

tools/perf/expectations.config

@@ -258,6 +258,7 @@ crbug.com/896851 [ Android ] system_health.common_mobile/background:tools:gmail
 crbug.com/896871 [ Android ] system_health.common_mobile/load:tools:gmail [ Skip ]
 crbug.com/923116 [ Android ] system_health.common_mobile/browse:shopping:avito [ Skip ]
 crbug.com/923527 [ Android_Webview ] system_health.common_mobile/load:media:soundcloud:2018 [ Skip ]
+crbug.com/954949 [ Nexus5X_Webview ] system_health.common_mobile/browse:news:washingtonpost [ Skip ]
 
 # Benchmark: system_health.memory_desktop
 crbug.com/728576 [ Mac ] system_health.memory_desktop/browse:news:cnn [ Skip ]
@@ -323,6 +324,7 @@ crbug.com/896851 [ Android ] system_health.memory_mobile/background:tools:gmail
 crbug.com/892704 [ Android_Webview ] system_health.memory_mobile/browse:tech:discourse_infinite_scroll:2018 [ Skip ]
 crbug.com/923527 [ Android_Webview ] system_health.memory_mobile/load:media:soundcloud:2018 [ Skip ]
 crbug.com/947267 [ Nexus_5X ] system_health.memory_mobile/background:media:imgur [ Skip ]
+crbug.com/954949 [ Nexus5X_Webview ] system_health.memory_mobile/browse:news:washingtonpost [ Skip ]
 
 # Benchmark: tab_switching.typical_25
 crbug.com/747026 [ Mac ] tab_switching.typical_25/multitab:misc:typical24 [ Skip ]
@@ -387,6 +389,7 @@ crbug.com/950757 [ Android_Go ] v8.browsing_mobile/browse:news:cnn:2018 [ Skip ]
 crbug.com/901967 [ Nexus6_Webview ] v8.browsing_mobile/browse:news:toi [ Skip ]
 crbug.com/923116 [ Android ] v8.browsing_mobile/browse:shopping:avito [ Skip ]
 crbug.com/929839 [ Android_Go ] v8.browsing_mobile/browse:chrome:newtab [ Skip ]
+crbug.com/954949 [ Nexus5X_Webview ] v8.browsing_mobile/browse:news:washingtonpost [ Skip ]
 
 # Benchmark: v8.browsing_mobile-future
 crbug.com/714650 [ Android ] v8.browsing_mobile-future/browse:news:globo [ Skip ]
@@ -402,6 +405,7 @@ crbug.com/865400 [ Pixel_2 ] v8.browsing_mobile-future/browse:shopping:avito [ S
 crbug.com/923116 [ Android ] v8.browsing_mobile-future/browse:shopping:avito [ Skip ]
 crbug.com/906654 [ All ] v8.browsing_mobile-future/browse:tech:discourse_infinite_scroll [ Skip ]
 crbug.com/906654 [ All ] v8.browsing_mobile-future/browse:social:facebook_infinite_scroll [ Skip ]
+crbug.com/954949 [ Nexus5X_Webview ] v8.browsing_mobile-future/browse:news:washingtonpost [ Skip ]
 
 # Benchmark: v8.detached_context_age_in_gc
 crbug.com/770982 [ Win ] v8.detached_context_age_in_gc/Docs_(1_open_document_tab) [ Skip ]