[tools/perf] Disable browse:media:youtube on WebView

Story started failing with Chrome crash in the range:
http://test-results.appspot.com/revision_range?start=566931&end=567000

TBR=nednguyen@google.com
NOTRY=true

Bug: 852840
Change-Id: I3e4ea10335259a2958eedc06fc1f7648b0ea2d5d
Reviewed-on: https://chromium-review.googlesource.com/1102320Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567589}

tools/perf/expectations.config

@@ -332,6 +332,7 @@ crbug.com/736147 [ Android_One ] system_health.common_mobile/browse:social:tumbl
 crbug.com/803461 [ Nexus_5 ] system_health.common_mobile/browse:chrome:newtab [ Skip ]
 crbug.com/842163 [ Android_One ] system_health.common_mobile/browse:social:facebook_infinite_scroll [ Skip ]
 crbug.com/842163 [ Android_One ] system_health.common_mobile/browse:social:pinterest_infinite_scroll [ Skip ]
+crbug.com/852840 [ Android_Webview ] system_health.common_mobile/browse:media:youtube [ Skip ]
 
 # Benchmark: system_health.memory_desktop
 crbug.com/728576 [ Mac ] system_health.memory_desktop/browse:news:cnn [ Skip ]
@@ -377,6 +378,7 @@ crbug.com/803462 [ Nexus_5 ] system_health.memory_mobile/browse:chrome:newtab [
 crbug.com/834905 [ Nexus_5 ] system_health.memory_mobile/browse:social:pinterest_infinite_scroll [ Skip ]
 crbug.com/842731 [ Android_One ] system_health.memory_mobile/background:news:nytimes [ Skip ]
 crbug.com/843547 [ Android_Go ] system_health.memory_mobile/background:news:nytimes [ Skip ]
+crbug.com/852840 [ Android_Webview ] system_health.memory_mobile/browse:media:youtube [ Skip ]
 
 # Benchmark: tab_switching.typical_25
 crbug.com/747026 [ Mac ] tab_switching.typical_25/multitab:misc:typical24 [ Skip ]