Disable some system_health stories on android-webview-go

TBR=perezju@chromium.org

Bug: 1007355
Change-Id: I77060168b5135d016d8f0cb11f613f9cfb37bee7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1822104Reviewed-by: Simon Hatch <simonhatch@chromium.org>
Commit-Queue: Simon Hatch <simonhatch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700299}

tools/perf/expectations.config

@@ -309,6 +309,7 @@ crbug.com/958422 [ win7 ] system_health.common_desktop/browse:social:tumblr_infi
 crbug.com/1008028 [ desktop ] system_health.common_desktop/browse:news:hackernews:2018 [ Skip ]
 
 # Benchmark: system_health.common_mobile
+crbug.com/1007355 [ android-go android-webview ] system_health.common_mobile/load:media:imgur:2018 [ Skip ]
 crbug.com/914390 [ android-nexus-5 ] system_health.common_mobile/browse:chrome:newtab [ Skip ]
 crbug.com/714650 [ android ] system_health.common_mobile/browse:news:globo [ Skip ]
 crbug.com/708300 [ android ] system_health.common_mobile/browse:shopping:flipkart [ Skip ]
@@ -354,6 +355,7 @@ crbug.com/959418 [ chromeos ] system_health.memory_desktop/load:games:spychase:2
 crbug.com/959418 [ chromeos ] system_health.memory_desktop/long_running:tools:gmail-foreground [ Skip ]
 
 # Benchmark: system_health.memory_mobile
+crbug.com/1007355 [ android-go android-webview ] system_health.memory_mobile/load:media:imgur:2018 [ Skip ]
 crbug.com/914390 [ android-nexus-5 ] system_health.memory_mobile/browse:chrome:newtab [ Skip ]
 crbug.com/714650 [ android ] system_health.memory_mobile/browse:news:globo [ Skip ]
 crbug.com/819552 [ android-nexus-5x ] system_health.memory_mobile/browse:chrome:omnibox [ Skip ]